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-x=-4x-31
We move all terms to the left:
-x-(-4x-31)=0
We add all the numbers together, and all the variables
-1x-(-4x-31)=0
We get rid of parentheses
-1x+4x+31=0
We add all the numbers together, and all the variables
3x+31=0
We move all terms containing x to the left, all other terms to the right
3x=-31
x=-31/3
x=-10+1/3
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