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9(13-x)-5(21-2x)-4x=9x
We simplify the equation to the form, which is simple to understand
9(13-x)-5(21-2x)-4x=9x
Reorder the terms in parentheses
+(+117-9x)-5*(21-2x)-4x=9x
Remove unnecessary parentheses
+117-9x-5+*(+21-2x+)-4x=+9x
Reorder the terms in parentheses
+117-9x+(-105+10x)-4x=9x
Remove unnecessary parentheses
+117-9x-105+10x-4x=+9x
We move all terms containing x to the left and all other terms to the right.
-9x+10x-4x-9x=-117+105
We simplify left and right side of the equation.
-12x=-12
We divide both sides of the equation by -12 to get x.
x=1
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