21-8-5y=12-9y

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Solution for 21-8-5y=12-9y equation: 


Simplifying
21 + -8 + -5y = 12 + -9y

Combine like terms: 21 + -8 = 13
13 + -5y = 12 + -9y

Solving
13 + -5y = 12 + -9y

Solving for variable 'y'.

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

Add '9y' to each side of the equation.
13 + -5y + 9y = 12 + -9y + 9y

Combine like terms: -5y + 9y = 4y
13 + 4y = 12 + -9y + 9y

Combine like terms: -9y + 9y = 0
13 + 4y = 12 + 0
13 + 4y = 12

Add '-13' to each side of the equation.
13 + -13 + 4y = 12 + -13

Combine like terms: 13 + -13 = 0
0 + 4y = 12 + -13
4y = 12 + -13

Combine like terms: 12 + -13 = -1
4y = -1

Divide each side by '4'.
y = -0.25

Simplifying
y = -0.25

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