20=9-.8y

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Solution for 20=9-.8y equation:


Simplifying
20 = 9 + -0.8y

Solving
20 = 9 + -0.8y

Solving for variable 'y'.

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

Add '0.8y' to each side of the equation.
20 + 0.8y = 9 + -0.8y + 0.8y

Combine like terms: -0.8y + 0.8y = 0.0
20 + 0.8y = 9 + 0.0
20 + 0.8y = 9

Add '-20' to each side of the equation.
20 + -20 + 0.8y = 9 + -20

Combine like terms: 20 + -20 = 0
0 + 0.8y = 9 + -20
0.8y = 9 + -20

Combine like terms: 9 + -20 = -11
0.8y = -11

Divide each side by '0.8'.
y = -13.75

Simplifying
y = -13.75

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