What about 3x = 9? From my knowledge, it seems like the equation is 3x+9=(2x+4y) ................editedLook at the figure carefully!
For the bottom balance:
How much weight on the right pan = y + y + y + y =4y
How much weight on the left pan = x +x = 2x
Since balance is in equilibrium, those must be equal.
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How did you get that? That is incorrect!What about 3x = 9? From my knowledge, it seems like the equation is 3x+9=(2x+4y) ................edited