3x-9=-21+x

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


Simplifying
3x + -9 = -21 + x

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

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

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

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

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

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

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

Divide each side by '2'.
x = -6

Simplifying
x = -6

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