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-2(4x+3)=15
We move all terms to the left:
-2(4x+3)-(15)=0
We multiply parentheses
-8x-6-15=0
We add all the numbers together, and all the variables
-8x-21=0
We move all terms containing x to the left, all other terms to the right
-8x=21
x=21/-8
x=-2+5/8
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