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(3+x)+(3+x)-100=0
We add all the numbers together, and all the variables
(x+3)+(x+3)-100=0
We get rid of parentheses
x+x+3+3-100=0
We add all the numbers together, and all the variables
2x-94=0
We move all terms containing x to the left, all other terms to the right
2x=94
x=94/2
x=47
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