21=5+4y

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Solution for 21=5+4y equation:


Simplifying
21 = 5 + 4y

Solving
21 = 5 + 4y

Solving for variable 'y'.

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

Add '-4y' to each side of the equation.
21 + -4y = 5 + 4y + -4y

Combine like terms: 4y + -4y = 0
21 + -4y = 5 + 0
21 + -4y = 5

Add '-21' to each side of the equation.
21 + -21 + -4y = 5 + -21

Combine like terms: 21 + -21 = 0
0 + -4y = 5 + -21
-4y = 5 + -21

Combine like terms: 5 + -21 = -16
-4y = -16

Divide each side by '-4'.
y = 4

Simplifying
y = 4

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