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(x+5)+(3x-5)=72
We move all terms to the left:
(x+5)+(3x-5)-(72)=0
We get rid of parentheses
x+3x+5-5-72=0
We add all the numbers together, and all the variables
4x-72=0
We move all terms containing x to the left, all other terms to the right
4x=72
x=72/4
x=18
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