Y+21=20

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Solution for Y+21=20 equation: 


Simplifying
Y + 21 = 20

Reorder the terms:
21 + Y = 20

Solving
21 + Y = 20

Solving for variable 'Y'.

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

Add '-21' to each side of the equation.
21 + -21 + Y = 20 + -21

Combine like terms: 21 + -21 = 0
0 + Y = 20 + -21
Y = 20 + -21

Combine like terms: 20 + -21 = -1
Y = -1

Simplifying
Y = -1

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