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(4x-15)+(5x+51)=180
We move all terms to the left:
(4x-15)+(5x+51)-(180)=0
We get rid of parentheses
4x+5x-15+51-180=0
We add all the numbers together, and all the variables
9x-144=0
We move all terms containing x to the left, all other terms to the right
9x=144
x=144/9
x=16
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