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40/(-5)=x
We move all terms to the left:
40/(-5)-(x)=0
We add all the numbers together, and all the variables
-1x+40/(-5)=0
We multiply all the terms by the denominator
-1x*(-5)+40=0
We multiply parentheses
5x+40=0
We move all terms containing x to the left, all other terms to the right
5x=-40
x=-40/5
x=-8
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