6=x-15

Solution for 6=x-15 equation:

Simplifying
6 = x + -15

Reorder the terms:
6 = -15 + x

Solving
6 = -15 + 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 + -1x = -15 + x + -1x

Combine like terms: x + -1x = 0
6 + -1x = -15 + 0
6 + -1x = -15

Add '-6' to each side of the equation.
6 + -6 + -1x = -15 + -6

Combine like terms: 6 + -6 = 0
0 + -1x = -15 + -6
-1x = -15 + -6

Combine like terms: -15 + -6 = -21
-1x = -21

Divide each side by '-1'.
x = 21

Simplifying
x = 21