3x-9x-21=0

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Solution for 3x-9x-21=0 equation:


Simplifying
3x + -9x + -21 = 0

Reorder the terms:
-21 + 3x + -9x = 0

Combine like terms: 3x + -9x = -6x
-21 + -6x = 0

Solving
-21 + -6x = 0

Solving for variable 'x'.

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

Add '21' to each side of the equation.
-21 + 21 + -6x = 0 + 21

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

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

Divide each side by '-6'.
x = -3.5

Simplifying
x = -3.5

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