9y-21=15

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Solution for 9y-21=15 equation: 


Simplifying
9y + -21 = 15

Reorder the terms:
-21 + 9y = 15

Solving
-21 + 9y = 15

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '21' to each side of the equation.
-21 + 21 + 9y = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 9y = 15 + 21
9y = 15 + 21

Combine like terms: 15 + 21 = 36
9y = 36

Divide each side by '9'.
y = 4

Simplifying
y = 4

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