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X+3X=7X+3
We move all terms to the left:
X+3X-(7X+3)=0
We add all the numbers together, and all the variables
4X-(7X+3)=0
We get rid of parentheses
4X-7X-3=0
We add all the numbers together, and all the variables
-3X-3=0
We move all terms containing X to the left, all other terms to the right
-3X=3
X=3/-3
X=-1
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