3(y+1)=-15

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Solution for 3(y+1)=-15 equation: 


Simplifying
3(y + 1) = -15

Reorder the terms:
3(1 + y) = -15
(1 * 3 + y * 3) = -15
(3 + 3y) = -15

Solving
3 + 3y = -15

Solving for variable 'y'.

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

Add '-3' to each side of the equation.
3 + -3 + 3y = -15 + -3

Combine like terms: 3 + -3 = 0
0 + 3y = -15 + -3
3y = -15 + -3

Combine like terms: -15 + -3 = -18
3y = -18

Divide each side by '3'.
y = -6

Simplifying
y = -6

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