20-9y=-y

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Solution for 20-9y=-y equation:


Simplifying
20 + -9y = -1y

Solving
20 + -9y = -1y

Solving for variable 'y'.

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

Add 'y' to each side of the equation.
20 + -9y + y = -1y + y

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

Combine like terms: -1y + y = 0
20 + -8y = 0

Add '-20' to each side of the equation.
20 + -20 + -8y = 0 + -20

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

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

Divide each side by '-8'.
y = 2.5

Simplifying
y = 2.5

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