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3x+18-2x(-4)=12
We move all terms to the left:
3x+18-2x(-4)-(12)=0
We add all the numbers together, and all the variables
3x-2x(-4)+6=0
We multiply parentheses
3x+8x+6=0
We add all the numbers together, and all the variables
11x+6=0
We move all terms containing x to the left, all other terms to the right
11x=-6
x=-6/11
x=-6/11
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