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3x+2(x+1)=107
We move all terms to the left:
3x+2(x+1)-(107)=0
We multiply parentheses
3x+2x+2-107=0
We add all the numbers together, and all the variables
5x-105=0
We move all terms containing x to the left, all other terms to the right
5x=105
x=105/5
x=21
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