21-y=-4

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Solution for 21-y=-4 equation: 


Simplifying
21 + -1y = -4

Solving
21 + -1y = -4

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 + -1y = -4 + -21

Combine like terms: 21 + -21 = 0
0 + -1y = -4 + -21
-1y = -4 + -21

Combine like terms: -4 + -21 = -25
-1y = -25

Divide each side by '-1'.
y = 25

Simplifying
y = 25

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