21+y=28

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Solution for 21+y=28 equation: 


Simplifying
21 + y = 28

Solving
21 + y = 28

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 = 28 + -21

Combine like terms: 21 + -21 = 0
0 + y = 28 + -21
y = 28 + -21

Combine like terms: 28 + -21 = 7
y = 7

Simplifying
y = 7

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