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(5x+4)+(3x+7)=180
We move all terms to the left:
(5x+4)+(3x+7)-(180)=0
We get rid of parentheses
5x+3x+4+7-180=0
We add all the numbers together, and all the variables
8x-169=0
We move all terms containing x to the left, all other terms to the right
8x=169
x=169/8
x=21+1/8
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