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13(x-21)=0
We simplify the equation to the form, which is simple to understand
13(x-21)=0
Reorder the terms in parentheses
+(+13x-273)=0
Remove unnecessary parentheses
+13x-273=0
We move all terms containing x to the left and all other terms to the right.
+13x=0+273
We simplify left and right side of the equation.
+13x=+273
We divide both sides of the equation by 13 to get x.
x=21
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