21+-1y=y+3

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Solution for 21+-1y=y+3 equation:


Simplifying
21 + -1y = y + 3

Reorder the terms:
21 + -1y = 3 + y

Solving
21 + -1y = 3 + 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 = 3 + y + -1y

Combine like terms: -1y + -1y = -2y
21 + -2y = 3 + y + -1y

Combine like terms: y + -1y = 0
21 + -2y = 3 + 0
21 + -2y = 3

Add '-21' to each side of the equation.
21 + -21 + -2y = 3 + -21

Combine like terms: 21 + -21 = 0
0 + -2y = 3 + -21
-2y = 3 + -21

Combine like terms: 3 + -21 = -18
-2y = -18

Divide each side by '-2'.
y = 9

Simplifying
y = 9

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