21=1-4y

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Solution for 21=1-4y equation:


Simplifying
21 = 1 + -4y

Solving
21 = 1 + -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 = 1 + -4y + 4y

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

Add '-21' to each side of the equation.
21 + -21 + 4y = 1 + -21

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

Combine like terms: 1 + -21 = -20
4y = -20

Divide each side by '4'.
y = -5

Simplifying
y = -5

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