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(5x+8)+(3x+4)=180
We move all terms to the left:
(5x+8)+(3x+4)-(180)=0
We get rid of parentheses
5x+3x+8+4-180=0
We add all the numbers together, and all the variables
8x-168=0
We move all terms containing x to the left, all other terms to the right
8x=168
x=168/8
x=21
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