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x-6+7=3x+15
We move all terms to the left:
x-6+7-(3x+15)=0
We add all the numbers together, and all the variables
x-(3x+15)+1=0
We get rid of parentheses
x-3x-15+1=0
We add all the numbers together, and all the variables
-2x-14=0
We move all terms containing x to the left, all other terms to the right
-2x=14
x=14/-2
x=-7
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