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(x+7)+(x+3)=40
We move all terms to the left:
(x+7)+(x+3)-(40)=0
We get rid of parentheses
x+x+7+3-40=0
We add all the numbers together, and all the variables
2x-30=0
We move all terms containing x to the left, all other terms to the right
2x=30
x=30/2
x=15
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