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15=-7x+3+6x
We move all terms to the left:
15-(-7x+3+6x)=0
We add all the numbers together, and all the variables
-(-1x+3)+15=0
We get rid of parentheses
1x-3+15=0
We add all the numbers together, and all the variables
x+12=0
We move all terms containing x to the left, all other terms to the right
x=-12
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