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