8y-21=5y

Solution for 8y-21=5y equation:

Simplifying
8y + -21 = 5y

Reorder the terms:
-21 + 8y = 5y

Solving
-21 + 8y = 5y

Solving for variable 'y'.

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

Add '-5y' to each side of the equation.
-21 + 8y + -5y = 5y + -5y

Combine like terms: 8y + -5y = 3y
-21 + 3y = 5y + -5y

Combine like terms: 5y + -5y = 0
-21 + 3y = 0

Add '21' to each side of the equation.
-21 + 21 + 3y = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 3y = 0 + 21
3y = 0 + 21

Combine like terms: 0 + 21 = 21
3y = 21

Divide each side by '3'.
y = 7

Simplifying
y = 7