(13-1y)+y=21

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Solution for (13-1y)+y=21 equation: 


Simplifying
(13 + -1y) + y = 21

Remove parenthesis around (13 + -1y)
13 + -1y + y = 21

Combine like terms: -1y + y = 0
13 + 0 = 21
13 = 21

Solving
13 = 21

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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