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3(x+4)-6x=-18
We move all terms to the left:
3(x+4)-6x-(-18)=0
We add all the numbers together, and all the variables
-6x+3(x+4)+18=0
We multiply parentheses
-6x+3x+12+18=0
We add all the numbers together, and all the variables
-3x+30=0
We move all terms containing x to the left, all other terms to the right
-3x=-30
x=-30/-3
x=+10
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