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3(x+8)=-42-12
We move all terms to the left:
3(x+8)-(-42-12)=0
We add all the numbers together, and all the variables
3(x+8)-(-54)=0
We add all the numbers together, and all the variables
3(x+8)+54=0
We multiply parentheses
3x+24+54=0
We add all the numbers together, and all the variables
3x+78=0
We move all terms containing x to the left, all other terms to the right
3x=-78
x=-78/3
x=-26
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