21+8x+(-15)=x

Solution for 21+8x+(-15)=x equation:

Simplifying
21 + 8x + (-15) = x
21 + 8x + -15 = x

Reorder the terms:
21 + -15 + 8x = x

Combine like terms: 21 + -15 = 6
6 + 8x = x

Solving
6 + 8x = x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
6 + 8x + -1x = x + -1x

Combine like terms: 8x + -1x = 7x
6 + 7x = x + -1x

Combine like terms: x + -1x = 0
6 + 7x = 0

Add '-6' to each side of the equation.
6 + -6 + 7x = 0 + -6

Combine like terms: 6 + -6 = 0
0 + 7x = 0 + -6
7x = 0 + -6

Combine like terms: 0 + -6 = -6
7x = -6

Divide each side by '7'.
x = -0.8571428571

Simplifying
x = -0.8571428571