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X5X=-40+3X
We move all terms to the left:
X5X-(-40+3X)=0
We add all the numbers together, and all the variables
X5X-(3X-40)=0
We get rid of parentheses
X5X-3X+40=0
We add all the numbers together, and all the variables
-3X+X5X+40=0
We move all terms containing X to the left, all other terms to the right
-3X+X5X=-40
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