15-y=-21

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Solution for 15-y=-21 equation: 


Simplifying
15 + -1y = -21

Solving
15 + -1y = -21

Solving for variable 'y'.

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

Add '-15' to each side of the equation.
15 + -15 + -1y = -21 + -15

Combine like terms: 15 + -15 = 0
0 + -1y = -21 + -15
-1y = -21 + -15

Combine like terms: -21 + -15 = -36
-1y = -36

Divide each side by '-1'.
y = 36

Simplifying
y = 36

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