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31-(2x+9)=2(x+6)+x
We move all terms to the left:
31-(2x+9)-(2(x+6)+x)=0
We get rid of parentheses
-2x-(2(x+6)+x)-9+31=0
We calculate terms in parentheses: -(2(x+6)+x), so:We add all the numbers together, and all the variables
2(x+6)+x
We add all the numbers together, and all the variables
x+2(x+6)
We multiply parentheses
x+2x+12
We add all the numbers together, and all the variables
3x+12
Back to the equation:
-(3x+12)
-2x-(3x+12)+22=0
We get rid of parentheses
-2x-3x-12+22=0
We add all the numbers together, and all the variables
-5x+10=0
We move all terms containing x to the left, all other terms to the right
-5x=-10
x=-10/-5
x=+2
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