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(7x+23)+(21x-11)=180
We move all terms to the left:
(7x+23)+(21x-11)-(180)=0
We get rid of parentheses
7x+21x+23-11-180=0
We add all the numbers together, and all the variables
28x-168=0
We move all terms containing x to the left, all other terms to the right
28x=168
x=168/28
x=6
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