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(x-7)*3=21
We simplify the equation to the form, which is simple to understand
(x-7)*3=21
Reorder the terms in parentheses
(+3x-21)=21
Remove unnecessary parentheses
+3x-21=21
We move all terms containing x to the left and all other terms to the right.
+3x=+21+21
We simplify left and right side of the equation.
+3x=+42
We divide both sides of the equation by 3 to get x.
x=14
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