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(x-9)+(x+5)=168
We move all terms to the left:
(x-9)+(x+5)-(168)=0
We get rid of parentheses
x+x-9+5-168=0
We add all the numbers together, and all the variables
2x-172=0
We move all terms containing x to the left, all other terms to the right
2x=172
x=172/2
x=86
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