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(21-3)*(3-1)=9x
We simplify the equation to the form, which is simple to understand
(21-3)*(3-1)=9x
Simplifying terms in parentheses
(+18)*(3-1)=9x
Simplifying terms in parentheses
(+18)*(+2)=9x
Reorder the terms in parentheses
multiplication of parentheses
(+36)=9x
Remove unnecessary parentheses
+36=9x
We move all terms containing x to the left and all other terms to the right.
-9x=-36
We simplify left and right side of the equation.
-9x=-36
We divide both sides of the equation by -09 to get x.
x=4
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