5(21+2y)+5y=0

Solution for 5(21+2y)+5y=0 equation:

Simplifying
5(21 + 2y) + 5y = 0
(21 * 5 + 2y * 5) + 5y = 0
(105 + 10y) + 5y = 0

Combine like terms: 10y + 5y = 15y
105 + 15y = 0

Solving
105 + 15y = 0

Solving for variable 'y'.

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

Add '-105' to each side of the equation.
105 + -105 + 15y = 0 + -105

Combine like terms: 105 + -105 = 0
0 + 15y = 0 + -105
15y = 0 + -105

Combine like terms: 0 + -105 = -105
15y = -105

Divide each side by '15'.
y = -7

Simplifying
y = -7