-5x-6+4x=21

Solution for -5x-6+4x=21 equation:

Simplifying
-5x + -6 + 4x = 21

Reorder the terms:
-6 + -5x + 4x = 21

Combine like terms: -5x + 4x = -1x
-6 + -1x = 21

Solving
-6 + -1x = 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 + -1x = 21 + 6

Combine like terms: -6 + 6 = 0
0 + -1x = 21 + 6
-1x = 21 + 6

Combine like terms: 21 + 6 = 27
-1x = 27

Divide each side by '-1'.
x = -27

Simplifying
x = -27