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-12=2(5x+4)
We move all terms to the left:
-12-(2(5x+4))=0
We calculate terms in parentheses: -(2(5x+4)), so:We get rid of parentheses
2(5x+4)
We multiply parentheses
10x+8
Back to the equation:
-(10x+8)
-10x-8-12=0
We add all the numbers together, and all the variables
-10x-20=0
We move all terms containing x to the left, all other terms to the right
-10x=20
x=20/-10
x=-2
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