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-12=4(2x+5)
We move all terms to the left:
-12-(4(2x+5))=0
We calculate terms in parentheses: -(4(2x+5)), so:We get rid of parentheses
4(2x+5)
We multiply parentheses
8x+20
Back to the equation:
-(8x+20)
-8x-20-12=0
We add all the numbers together, and all the variables
-8x-32=0
We move all terms containing x to the left, all other terms to the right
-8x=32
x=32/-8
x=-4
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