15-9=y+3

Solution for 15-9=y+3 equation:

Simplifying
15 + -9 = y + 3

Combine like terms: 15 + -9 = 6
6 = y + 3

Reorder the terms:
6 = 3 + y

Solving
6 = 3 + y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
6 + -1y = 3 + y + -1y

Combine like terms: y + -1y = 0
6 + -1y = 3 + 0
6 + -1y = 3

Add '-6' to each side of the equation.
6 + -6 + -1y = 3 + -6

Combine like terms: 6 + -6 = 0
0 + -1y = 3 + -6
-1y = 3 + -6

Combine like terms: 3 + -6 = -3
-1y = -3

Divide each side by '-1'.
y = 3

Simplifying
y = 3