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-x-2(x-5)=31
We move all terms to the left:
-x-2(x-5)-(31)=0
We add all the numbers together, and all the variables
-1x-2(x-5)-31=0
We multiply parentheses
-1x-2x+10-31=0
We add all the numbers together, and all the variables
-3x-21=0
We move all terms containing x to the left, all other terms to the right
-3x=21
x=21/-3
x=-7
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