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3(7x-3)=180
We simplify the equation to the form, which is simple to understand
3(7x-3)=180
Reorder the terms in parentheses
+(+21x-9)=180
Remove unnecessary parentheses
+21x-9=+180
We move all terms containing x to the left and all other terms to the right.
+21x=+180+9
We simplify left and right side of the equation.
+21x=+189
We divide both sides of the equation by 21 to get x.
x=9
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