When simplified, in the first highlighted equation, the constant is subtracted from the variable. In the last highlighted equation the constant is added to the variable, should it not be -(-17 - 9) = 8?
Edit: I believe i read it wrong. In the example, in the checking step of the equations I believe they just put the variables number into the equation but its not simplified further just yet, which confused me.
Edit: I believe i read it wrong. In the example, in the checking step of the equations I believe they just put the variables number into the equation but its not simplified further just yet, which confused me.
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