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6x+3=-12+3x
We move all terms to the left:
6x+3-(-12+3x)=0
We add all the numbers together, and all the variables
6x-(3x-12)+3=0
We get rid of parentheses
6x-3x+12+3=0
We add all the numbers together, and all the variables
3x+15=0
We move all terms containing x to the left, all other terms to the right
3x=-15
x=-15/3
x=-5
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