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-10+7x+x=-90
We simplify the equation to the form, which is simple to understand
-10+7x+x=-90
We move all terms containing x to the left and all other terms to the right.
+7x+1x=-90+10
We simplify left and right side of the equation.
+8x=-80
We divide both sides of the equation by 8 to get x.
x=-10
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