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-115=7x+5x-7
We simplify the equation to the form, which is simple to understand
-115=7x+5x-7
We move all terms containing x to the left and all other terms to the right.
-7x-5x=-7+115
We simplify left and right side of the equation.
-12x=+108
We divide both sides of the equation by -12 to get x.
x=-9
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