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6x+4=-4(x+9)
We move all terms to the left:
6x+4-(-4(x+9))=0
We calculate terms in parentheses: -(-4(x+9)), so:We get rid of parentheses
-4(x+9)
We multiply parentheses
-4x-36
Back to the equation:
-(-4x-36)
6x+4x+36+4=0
We add all the numbers together, and all the variables
10x+40=0
We move all terms containing x to the left, all other terms to the right
10x=-40
x=-40/10
x=-4
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