x-21=5x-9

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Solution for x-21=5x-9 equation:


Simplifying
x + -21 = 5x + -9

Reorder the terms:
-21 + x = 5x + -9

Reorder the terms:
-21 + x = -9 + 5x

Solving
-21 + x = -9 + 5x

Solving for variable 'x'.

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

Add '-5x' to each side of the equation.
-21 + x + -5x = -9 + 5x + -5x

Combine like terms: x + -5x = -4x
-21 + -4x = -9 + 5x + -5x

Combine like terms: 5x + -5x = 0
-21 + -4x = -9 + 0
-21 + -4x = -9

Add '21' to each side of the equation.
-21 + 21 + -4x = -9 + 21

Combine like terms: -21 + 21 = 0
0 + -4x = -9 + 21
-4x = -9 + 21

Combine like terms: -9 + 21 = 12
-4x = 12

Divide each side by '-4'.
x = -3

Simplifying
x = -3

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