3(y+1)+9(y+1)=

Solution for 3(y+1)+9(y+1)= equation:

Simplifying
3(y + 1) + 9(y + 1) = 0

Reorder the terms:
3(1 + y) + 9(y + 1) = 0
(1 * 3 + y * 3) + 9(y + 1) = 0
(3 + 3y) + 9(y + 1) = 0

Reorder the terms:
3 + 3y + 9(1 + y) = 0
3 + 3y + (1 * 9 + y * 9) = 0
3 + 3y + (9 + 9y) = 0

Reorder the terms:
3 + 9 + 3y + 9y = 0

Combine like terms: 3 + 9 = 12
12 + 3y + 9y = 0

Combine like terms: 3y + 9y = 12y
12 + 12y = 0

Solving
12 + 12y = 0

Solving for variable 'y'.

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

Add '-12' to each side of the equation.
12 + -12 + 12y = 0 + -12

Combine like terms: 12 + -12 = 0
0 + 12y = 0 + -12
12y = 0 + -12

Combine like terms: 0 + -12 = -12
12y = -12

Divide each side by '12'.
y = -1

Simplifying
y = -1