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2(9+y)=30
We simplify the equation to the form, which is simple to understand
2(9+y)=30
Reorder the terms in parentheses
+(+18+2y)=30
Remove unnecessary parentheses
+18+2y=+30
We move all terms containing y to the left and all other terms to the right.
+2y=+30-18
We simplify left and right side of the equation.
+2y=+12
We divide both sides of the equation by 2 to get y.
y=6
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