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-4x=-4x-40-3x
We move all terms to the left:
-4x-(-4x-40-3x)=0
We add all the numbers together, and all the variables
-4x-(-7x-40)=0
We get rid of parentheses
-4x+7x+40=0
We add all the numbers together, and all the variables
3x+40=0
We move all terms containing x to the left, all other terms to the right
3x=-40
x=-40/3
x=-13+1/3
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