21=8y-4

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Solution for 21=8y-4 equation:


Simplifying
21 = 8y + -4

Reorder the terms:
21 = -4 + 8y

Solving
21 = -4 + 8y

Solving for variable 'y'.

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

Add '-8y' to each side of the equation.
21 + -8y = -4 + 8y + -8y

Combine like terms: 8y + -8y = 0
21 + -8y = -4 + 0
21 + -8y = -4

Add '-21' to each side of the equation.
21 + -21 + -8y = -4 + -21

Combine like terms: 21 + -21 = 0
0 + -8y = -4 + -21
-8y = -4 + -21

Combine like terms: -4 + -21 = -25
-8y = -25

Divide each side by '-8'.
y = 3.125

Simplifying
y = 3.125

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