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(x+10)+(x-10)=144
We move all terms to the left:
(x+10)+(x-10)-(144)=0
We get rid of parentheses
x+x+10-10-144=0
We add all the numbers together, and all the variables
2x-144=0
We move all terms containing x to the left, all other terms to the right
2x=144
x=144/2
x=72
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