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(2x+21)+107=180
We move all terms to the left:
(2x+21)+107-(180)=0
We add all the numbers together, and all the variables
(2x+21)-73=0
We get rid of parentheses
2x+21-73=0
We add all the numbers together, and all the variables
2x-52=0
We move all terms containing x to the left, all other terms to the right
2x=52
x=52/2
x=26
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