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(2x-21)+85=180
We move all terms to the left:
(2x-21)+85-(180)=0
We add all the numbers together, and all the variables
(2x-21)-95=0
We get rid of parentheses
2x-21-95=0
We add all the numbers together, and all the variables
2x-116=0
We move all terms containing x to the left, all other terms to the right
2x=116
x=116/2
x=58
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