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