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31+6x=2(-x+2)-21
We move all terms to the left:
31+6x-(2(-x+2)-21)=0
We add all the numbers together, and all the variables
6x-(2(-1x+2)-21)+31=0
We calculate terms in parentheses: -(2(-1x+2)-21), so:We get rid of parentheses
2(-1x+2)-21
We multiply parentheses
-2x+4-21
We add all the numbers together, and all the variables
-2x-17
Back to the equation:
-(-2x-17)
6x+2x+17+31=0
We add all the numbers together, and all the variables
8x+48=0
We move all terms containing x to the left, all other terms to the right
8x=-48
x=-48/8
x=-6
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