y+9=20

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Solution for y+9=20 equation: 


Simplifying
y + 9 = 20

Reorder the terms:
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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