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X=4X-45
We move all terms to the left:
X-(4X-45)=0
We get rid of parentheses
X-4X+45=0
We add all the numbers together, and all the variables
-3X+45=0
We move all terms containing X to the left, all other terms to the right
-3X=-45
X=-45/-3
X=+15
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