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X+6X=12+15+3X
We move all terms to the left:
X+6X-(12+15+3X)=0
We add all the numbers together, and all the variables
X+6X-(3X+27)=0
We add all the numbers together, and all the variables
7X-(3X+27)=0
We get rid of parentheses
7X-3X-27=0
We add all the numbers together, and all the variables
4X-27=0
We move all terms containing X to the left, all other terms to the right
4X=27
X=27/4
X=6+3/4
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