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-10 + 5 x - 4x = 80
We simplify the equation to the form, which is simple to understand
-10+5x-4x=80
We move all terms containing x to the left and all other terms to the right.
+5x-4x=+80+10
We simplify left and right side of the equation.
+1x=+90
We divide both sides of the equation by 1 to get x.
x=90
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