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X+40=6X+90
We move all terms to the left:
X+40-(6X+90)=0
We get rid of parentheses
X-6X-90+40=0
We add all the numbers together, and all the variables
-5X-50=0
We move all terms containing X to the left, all other terms to the right
-5X=50
X=50/-5
X=-10
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