3y-15=-21

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Solution for 3y-15=-21 equation: 


Simplifying
3y + -15 = -21

Reorder the terms:
-15 + 3y = -21

Solving
-15 + 3y = -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 + 3y = -21 + 15

Combine like terms: -15 + 15 = 0
0 + 3y = -21 + 15
3y = -21 + 15

Combine like terms: -21 + 15 = -6
3y = -6

Divide each side by '3'.
y = -2

Simplifying
y = -2

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