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-30=-12+6x
We move all terms to the left:
-30-(-12+6x)=0
We add all the numbers together, and all the variables
-(6x-12)-30=0
We get rid of parentheses
-6x+12-30=0
We add all the numbers together, and all the variables
-6x-18=0
We move all terms containing x to the left, all other terms to the right
-6x=18
x=18/-6
x=-3
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