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3(y-4)=21
We simplify the equation to the form, which is simple to understand
3(y-4)=21
Reorder the terms in parentheses
+(+3y-12)=21
Remove unnecessary parentheses
+3y-12=+21
We move all terms containing y to the left and all other terms to the right.
+3y=+21+12
We simplify left and right side of the equation.
+3y=+33
We divide both sides of the equation by 3 to get y.
y=11
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