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x-2(4x-x)=31
We move all terms to the left:
x-2(4x-x)-(31)=0
We add all the numbers together, and all the variables
x-2(+3x)-31=0
We multiply parentheses
x-6x-31=0
We add all the numbers together, and all the variables
-5x-31=0
We move all terms containing x to the left, all other terms to the right
-5x=31
x=31/-5
x=-6+1/5
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