3x-21=x-9

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


Simplifying
3x + -21 = x + -9

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

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

Solving
-21 + 3x = -9 + 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.
-21 + 3x + -1x = -9 + x + -1x

Combine like terms: 3x + -1x = 2x
-21 + 2x = -9 + x + -1x

Combine like terms: x + -1x = 0
-21 + 2x = -9 + 0
-21 + 2x = -9

Add '21' to each side of the equation.
-21 + 21 + 2x = -9 + 21

Combine like terms: -21 + 21 = 0
0 + 2x = -9 + 21
2x = -9 + 21

Combine like terms: -9 + 21 = 12
2x = 12

Divide each side by '2'.
x = 6

Simplifying
x = 6

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