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9(13-x)-4x=5(21-2x)+9
We simplify the equation to the form, which is simple to understand
9(13-x)-4x=5(21-2x)+9
Reorder the terms in parentheses
+(+117-9x)-4x=5*(21-2x)+9
Remove unnecessary parentheses
+117-9x-4x=+5+*(+21-2x+)+9
Reorder the terms in parentheses
+117-9x-4x=+(+105-10x)+9
Remove unnecessary parentheses
+117-9x-4x=+105-10x+9
We move all terms containing x to the left and all other terms to the right.
-9x-4x+10x=+105+9-117
We simplify left and right side of the equation.
-3x=-3
We divide both sides of the equation by -3 to get x.
x=1
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