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3x-4x+12=-6x+3
We move all terms to the left:
3x-4x+12-(-6x+3)=0
We add all the numbers together, and all the variables
-1x-(-6x+3)+12=0
We get rid of parentheses
-1x+6x-3+12=0
We add all the numbers together, and all the variables
5x+9=0
We move all terms containing x to the left, all other terms to the right
5x=-9
x=-9/5
x=-1+4/5
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