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4x-16+5x+7+5x+7=180
We move all terms to the left:
4x-16+5x+7+5x+7-(180)=0
We add all the numbers together, and all the variables
14x-182=0
We move all terms containing x to the left, all other terms to the right
14x=182
x=182/14
x=13
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