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15+2(3x-7)-(5+x)=31
We move all terms to the left:
15+2(3x-7)-(5+x)-(31)=0
We add all the numbers together, and all the variables
2(3x-7)-(x+5)+15-31=0
We add all the numbers together, and all the variables
2(3x-7)-(x+5)-16=0
We multiply parentheses
6x-(x+5)-14-16=0
We get rid of parentheses
6x-x-5-14-16=0
We add all the numbers together, and all the variables
5x-35=0
We move all terms containing x to the left, all other terms to the right
5x=35
x=35/5
x=7
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