15=3+2(y+1)

Solution for 15=3+2(y+1) equation:

Simplifying
15 = 3 + 2(y + 1)

Reorder the terms:
15 = 3 + 2(1 + y)
15 = 3 + (1 * 2 + y * 2)
15 = 3 + (2 + 2y)

Combine like terms: 3 + 2 = 5
15 = 5 + 2y

Solving
15 = 5 + 2y

Solving for variable 'y'.

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

Add '-2y' to each side of the equation.
15 + -2y = 5 + 2y + -2y

Combine like terms: 2y + -2y = 0
15 + -2y = 5 + 0
15 + -2y = 5

Add '-15' to each side of the equation.
15 + -15 + -2y = 5 + -15

Combine like terms: 15 + -15 = 0
0 + -2y = 5 + -15
-2y = 5 + -15

Combine like terms: 5 + -15 = -10
-2y = -10

Divide each side by '-2'.
y = 5

Simplifying
y = 5