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(5x-9)+(4x+7)=180
We move all terms to the left:
(5x-9)+(4x+7)-(180)=0
We get rid of parentheses
5x+4x-9+7-180=0
We add all the numbers together, and all the variables
9x-182=0
We move all terms containing x to the left, all other terms to the right
9x=182
x=182/9
x=20+2/9
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