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-x+13=3x+40-3x
We move all terms to the left:
-x+13-(3x+40-3x)=0
We add all the numbers together, and all the variables
-x+13-40=0
We add all the numbers together, and all the variables
-1x-27=0
We move all terms containing x to the left, all other terms to the right
-x=27
x=27/-1
x=-27
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