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-3(x+8)+30=12-4x
We move all terms to the left:
-3(x+8)+30-(12-4x)=0
We add all the numbers together, and all the variables
-3(x+8)-(-4x+12)+30=0
We multiply parentheses
-3x-(-4x+12)-24+30=0
We get rid of parentheses
-3x+4x-12-24+30=0
We add all the numbers together, and all the variables
x-6=0
We move all terms containing x to the left, all other terms to the right
x=6
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