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X+5(8-X)=40
We move all terms to the left:
X+5(8-X)-(40)=0
We add all the numbers together, and all the variables
X+5(-1X+8)-40=0
We multiply parentheses
X-5X+40-40=0
We add all the numbers together, and all the variables
-4X=0
X=0/-4
X=0
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