12-y+9y=20

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Solution for 12-y+9y=20 equation: 


Simplifying
12 + -1y + 9y = 20

Combine like terms: -1y + 9y = 8y
12 + 8y = 20

Solving
12 + 8y = 20

Solving for variable 'y'.

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

Add '-12' to each side of the equation.
12 + -12 + 8y = 20 + -12

Combine like terms: 12 + -12 = 0
0 + 8y = 20 + -12
8y = 20 + -12

Combine like terms: 20 + -12 = 8
8y = 8

Divide each side by '8'.
y = 1

Simplifying
y = 1

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