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-18=-4x-2(-6x-15)
We move all terms to the left:
-18-(-4x-2(-6x-15))=0
We calculate terms in parentheses: -(-4x-2(-6x-15)), so:We get rid of parentheses
-4x-2(-6x-15)
We multiply parentheses
-4x+12x+30
We add all the numbers together, and all the variables
8x+30
Back to the equation:
-(8x+30)
-8x-30-18=0
We add all the numbers together, and all the variables
-8x-48=0
We move all terms containing x to the left, all other terms to the right
-8x=48
x=48/-8
x=-6
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