21=(3+2)y

Solution for 21=(3+2)y equation:

Simplifying
21 = (3 + 2) * y

Combine like terms: 3 + 2 = 5
21 = (5) * y

Solving
21 = 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 + -5y = 5y + -5y

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

Add '-21' to each side of the equation.
21 + -21 + -5y = 0 + -21

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

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

Divide each side by '-5'.
y = 4.2

Simplifying
y = 4.2