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15y+21-3y=1/3(9y+15)+(9y+16)
We simplify the equation to the form, which is simple to understand
15y+21-3y=1/3(9y+15)+(9y+16)
Reorder the terms in parentheses
15y+21-3y=+(+3y+5)+(9y+16)
Remove unnecessary parentheses
+15y+21-3y=+3y+5+(+9y+16+)
Remove unnecessary parentheses
+15y+21-3y=+3y+5+9y+16
We move all terms containing y to the left and all other terms to the right.
+15y-3y-3y-9y=+5+16-21
We simplify left and right side of the equation.
y=0
0=0
This equation is an identity, so all real numbers are solutions.
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