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8x+2(5x+4)=-12
We move all terms to the left:
8x+2(5x+4)-(-12)=0
We add all the numbers together, and all the variables
8x+2(5x+4)+12=0
We multiply parentheses
8x+10x+8+12=0
We add all the numbers together, and all the variables
18x+20=0
We move all terms containing x to the left, all other terms to the right
18x=-20
x=-20/18
x=-1+1/9
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