-9+y=-20

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Solution for -9+y=-20 equation:


Simplifying
-9 + y = -20

Solving
-9 + y = -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 + y = -20 + 9

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

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

Simplifying
y = -11

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