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-x+5x+7=-15
We simplify the equation to the form, which is simple to understand
-x+5x+7=-15
We move all terms containing x to the left and all other terms to the right.
-1x+5x=-15-7
We simplify left and right side of the equation.
+4x=-22
We divide both sides of the equation by 4 to get x.
x=-5.5
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