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28=-5x-7x-14
We simplify the equation to the form, which is simple to understand
28=-5x-7x-14
We move all terms containing x to the left and all other terms to the right.
+5x+7x=-14-28
We simplify left and right side of the equation.
+12x=-42
We divide both sides of the equation by 12 to get x.
x=-3.5
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