15=-3y+21

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Solution for 15=-3y+21 equation:


Simplifying
15 = -3y + 21

Reorder the terms:
15 = 21 + -3y

Solving
15 = 21 + -3y

Solving for variable 'y'.

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

Add '3y' to each side of the equation.
15 + 3y = 21 + -3y + 3y

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

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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