2y+21=-5y

Solution for 2y+21=-5y equation:

Simplifying
2y + 21 = -5y

Reorder the terms:
21 + 2y = -5y

Solving
21 + 2y = -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 + 2y + 5y = -5y + 5y

Combine like terms: 2y + 5y = 7y
21 + 7y = -5y + 5y

Combine like terms: -5y + 5y = 0
21 + 7y = 0

Add '-21' to each side of the equation.
21 + -21 + 7y = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 7y = 0 + -21
7y = 0 + -21

Combine like terms: 0 + -21 = -21
7y = -21

Divide each side by '7'.
y = -3

Simplifying
y = -3