# Algebra Exam revision

#### lev888

##### Full Member
View attachment 12228I have a Summer Exam , at the begging of next week on all topics that we have done , so I decided to do Algebra , but I forgot have to do it , because it was a while ago, can anyone show me the method again please to memorize.
Thanks in advance
Do you know how to combine like terms? (4x and 3x, 5 and 6)
Do you know how to solve 5x=15?

x=3

#### lev888

##### Full Member
Ok, do you know how to simplify the original equation, so it looks like 5x=15?

#### math 2019

##### New member
divide by 3 both sides
both I haven't clue how to do longer ones

#### lev888

##### Full Member
How do you simplify 4x+5=3x+6 so it looks similar to 5x=15?

#### math 2019

##### New member
Is it 4x-3x=1x)=(5+6=11)
1x/1=11/1
x=11

#### lev888

##### Full Member
Is it 4x-3x=1x)=(5+6=11)
1x/1=11/1
x=11
4x-3x is correct.
5+6 is not, do you know why?
Also, when you are simplifying equations do each step on a new line instead of using "=".

#### Harry_the_cat

##### Senior Member
Whatever you do to one side of an equation, you have to do to the other.
Think of an equation as a scale balance with 4x + 5 on one side and 3x + 6 on the other.
4x + 5 = 3x + 6
Take away 3x from each side:
1x + 5 =6
Now take away 5 from each side:
x = 1

Check your answer. Does 4*1 +5 = 3*1 +6?

#### Otis

##### Senior Member
... I have a Summer Exam ... on all topics that we have done, so I decided to [practice] Algebra, but I forgot [how] to do it ...
Hello. You could review beginning algebra, at web sites that teach it.

For example, you could start watching short beginning-algebra videos at Khan Academy, to refresh your memory. Cheers 