15x-6=12x-21

Solution for 15x-6=12x-21 equation:

Simplifying
15x + -6 = 12x + -21

Reorder the terms:
-6 + 15x = 12x + -21

Reorder the terms:
-6 + 15x = -21 + 12x

Solving
-6 + 15x = -21 + 12x

Solving for variable 'x'.

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

Add '-12x' to each side of the equation.
-6 + 15x + -12x = -21 + 12x + -12x

Combine like terms: 15x + -12x = 3x
-6 + 3x = -21 + 12x + -12x

Combine like terms: 12x + -12x = 0
-6 + 3x = -21 + 0
-6 + 3x = -21

Add '6' to each side of the equation.
-6 + 6 + 3x = -21 + 6

Combine like terms: -6 + 6 = 0
0 + 3x = -21 + 6
3x = -21 + 6

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

Divide each side by '3'.
x = -5

Simplifying
x = -5