How do you solve - 15 = 6x + 15-10x

-15 = 6x + 15 - 10x

1st. You combine like terms

(6-10) x

-15 = - 4x + 15

2nd. You move variables to the left side and change the sign

-15 = - 4x + 15

+4x + 4x

4x - 15 = 15

+15 + 15

4x = 30

3rd. You divide both sides of the equation by 4

(4x) / 4 = (30) / 4

x = 30/4

4th. Reduce the fraction by 2

30 / 4 = 15/2

Answer is 15/2