15=3a-4-2

Solution for 15=3a-4-2 equation:

Simplifying
15 = 3a + -4 + -2

Reorder the terms:
15 = -4 + -2 + 3a

Combine like terms: -4 + -2 = -6
15 = -6 + 3a

Solving
15 = -6 + 3a

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
15 + -3a = -6 + 3a + -3a

Combine like terms: 3a + -3a = 0
15 + -3a = -6 + 0
15 + -3a = -6

Add '-15' to each side of the equation.
15 + -15 + -3a = -6 + -15

Combine like terms: 15 + -15 = 0
0 + -3a = -6 + -15
-3a = -6 + -15

Combine like terms: -6 + -15 = -21
-3a = -21

Divide each side by '-3'.
a = 7

Simplifying
a = 7