-9+9y-10y=-20

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Solution for -9+9y-10y=-20 equation: 


Simplifying
-9 + 9y + -10y = -20

Combine like terms: 9y + -10y = -1y
-9 + -1y = -20

Solving
-9 + -1y = -20

Solving for variable 'y'.

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

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

Combine like terms: -9 + 9 = 0
0 + -1y = -20 + 9
-1y = -20 + 9

Combine like terms: -20 + 9 = -11
-1y = -11

Divide each side by '-1'.
y = 11

Simplifying
y = 11

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