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(3x+74)+(5x+129)+49=180
We move all terms to the left:
(3x+74)+(5x+129)+49-(180)=0
We add all the numbers together, and all the variables
(3x+74)+(5x+129)-131=0
We get rid of parentheses
3x+5x+74+129-131=0
We add all the numbers together, and all the variables
8x+72=0
We move all terms containing x to the left, all other terms to the right
8x=-72
x=-72/8
x=-9
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