3y+15-21=

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Solution for 3y+15-21= equation: 


Simplifying
3y + 15 + -21 = 0

Reorder the terms:
15 + -21 + 3y = 0

Combine like terms: 15 + -21 = -6
-6 + 3y = 0

Solving
-6 + 3y = 0

Solving for variable 'y'.

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

Add '6' to each side of the equation.
-6 + 6 + 3y = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 3y = 0 + 6
3y = 0 + 6

Combine like terms: 0 + 6 = 6
3y = 6

Divide each side by '3'.
y = 2

Simplifying
y = 2

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