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6x+6(1+3x)=-18
We move all terms to the left:
6x+6(1+3x)-(-18)=0
We add all the numbers together, and all the variables
6x+6(3x+1)-(-18)=0
We add all the numbers together, and all the variables
6x+6(3x+1)+18=0
We multiply parentheses
6x+18x+6+18=0
We add all the numbers together, and all the variables
24x+24=0
We move all terms containing x to the left, all other terms to the right
24x=-24
x=-24/24
x=-1
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