21-y=y+2

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Solution for 21-y=y+2 equation:


Simplifying
21 + -1y = y + 2

Reorder the terms:
21 + -1y = 2 + y

Solving
21 + -1y = 2 + y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
21 + -1y + -1y = 2 + y + -1y

Combine like terms: -1y + -1y = -2y
21 + -2y = 2 + y + -1y

Combine like terms: y + -1y = 0
21 + -2y = 2 + 0
21 + -2y = 2

Add '-21' to each side of the equation.
21 + -21 + -2y = 2 + -21

Combine like terms: 21 + -21 = 0
0 + -2y = 2 + -21
-2y = 2 + -21

Combine like terms: 2 + -21 = -19
-2y = -19

Divide each side by '-2'.
y = 9.5

Simplifying
y = 9.5

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