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X+25=3X-45
We move all terms to the left:
X+25-(3X-45)=0
We get rid of parentheses
X-3X+45+25=0
We add all the numbers together, and all the variables
-2X+70=0
We move all terms containing X to the left, all other terms to the right
-2X=-70
X=-70/-2
X=+35
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