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(7x+42)+(10x-49)=180
We move all terms to the left:
(7x+42)+(10x-49)-(180)=0
We get rid of parentheses
7x+10x+42-49-180=0
We add all the numbers together, and all the variables
17x-187=0
We move all terms containing x to the left, all other terms to the right
17x=187
x=187/17
x=11
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