12y=15y+-21

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Solution for 12y=15y+-21 equation: 


Simplifying
12y = 15y + -21

Reorder the terms:
12y = -21 + 15y

Solving
12y = -21 + 15y

Solving for variable 'y'.

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

Add '-15y' to each side of the equation.
12y + -15y = -21 + 15y + -15y

Combine like terms: 12y + -15y = -3y
-3y = -21 + 15y + -15y

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

Divide each side by '-3'.
y = 7

Simplifying
y = 7

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