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(7x+21)+(10x-3)=180
We move all terms to the left:
(7x+21)+(10x-3)-(180)=0
We get rid of parentheses
7x+10x+21-3-180=0
We add all the numbers together, and all the variables
17x-162=0
We move all terms containing x to the left, all other terms to the right
17x=162
x=162/17
x=9+9/17
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