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-6x-9=-7x+2(2x+6)
We simplify the equation to the form, which is simple to understand
-6x-9=-7x+2(2x+6)
Reorder the terms in parentheses
-6x-9=-7x+(+4x+12)
Remove unnecessary parentheses
-6x-9=-7x+4x+12
We move all terms containing x to the left and all other terms to the right.
-6x+7x-4x=+12+9
We simplify left and right side of the equation.
-3x=+21
We divide both sides of the equation by -3 to get x.
x=-7
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