6(x-1)-x=21

Solution for 6(x-1)-x=21 equation:

Simplifying
6(x + -1) + -1x = 21

Reorder the terms:
6(-1 + x) + -1x = 21
(-1 * 6 + x * 6) + -1x = 21
(-6 + 6x) + -1x = 21

Combine like terms: 6x + -1x = 5x
-6 + 5x = 21

Solving
-6 + 5x = 21

Solving for variable 'x'.

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

Add '6' to each side of the equation.
-6 + 6 + 5x = 21 + 6

Combine like terms: -6 + 6 = 0
0 + 5x = 21 + 6
5x = 21 + 6

Combine like terms: 21 + 6 = 27
5x = 27

Divide each side by '5'.
x = 5.4

Simplifying
x = 5.4