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7(x-3)=0
We simplify the equation to the form, which is simple to understand
7(x-3)=0
Reorder the terms in parentheses
+(+7x-21)=0
Remove unnecessary parentheses
+7x-21=0
We move all terms containing x to the left and all other terms to the right.
+7x=0+21
We simplify left and right side of the equation.
+7x=+21
We divide both sides of the equation by 7 to get x.
x=3
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