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20+2x=3(-x+7)-31
We move all terms to the left:
20+2x-(3(-x+7)-31)=0
We add all the numbers together, and all the variables
2x-(3(-1x+7)-31)+20=0
We calculate terms in parentheses: -(3(-1x+7)-31), so:We get rid of parentheses
3(-1x+7)-31
We multiply parentheses
-3x+21-31
We add all the numbers together, and all the variables
-3x-10
Back to the equation:
-(-3x-10)
2x+3x+10+20=0
We add all the numbers together, and all the variables
5x+30=0
We move all terms containing x to the left, all other terms to the right
5x=-30
x=-30/5
x=-6
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