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180-1x-9(90-1x)=50
We simplify the equation to the form, which is simple to understand
180-1x-9(90-1x)=50
Reorder the terms in parentheses
180-1x+(-810+9x)=50
Remove unnecessary parentheses
+180-1x-810+9x=+50
We move all terms containing x to the left and all other terms to the right.
-1x+9x=+50-180+810
We simplify left and right side of the equation.
+8x=+680
We divide both sides of the equation by 8 to get x.
x=85
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