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