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6x+9=-2(x-4)
We move all terms to the left:
6x+9-(-2(x-4))=0
We calculate terms in parentheses: -(-2(x-4)), so:We get rid of parentheses
-2(x-4)
We multiply parentheses
-2x+8
Back to the equation:
-(-2x+8)
6x+2x-8+9=0
We add all the numbers together, and all the variables
8x+1=0
We move all terms containing x to the left, all other terms to the right
8x=-1
x=-1/8
x=-1/8
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