y+3y+2(y+3)=15

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

Simplifying
y + 3y + 2(y + 3) = 15

Reorder the terms:
y + 3y + 2(3 + y) = 15
y + 3y + (3 * 2 + y * 2) = 15
y + 3y + (6 + 2y) = 15

Reorder the terms:
6 + y + 3y + 2y = 15

Combine like terms: y + 3y = 4y
6 + 4y + 2y = 15

Combine like terms: 4y + 2y = 6y
6 + 6y = 15

Solving
6 + 6y = 15

Solving for variable 'y'.

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

Add '-6' to each side of the equation.
6 + -6 + 6y = 15 + -6

Combine like terms: 6 + -6 = 0
0 + 6y = 15 + -6
6y = 15 + -6

Combine like terms: 15 + -6 = 9
6y = 9

Divide each side by '6'.
y = 1.5

Simplifying
y = 1.5