3X+9=X-21

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


Simplifying
3X + 9 = X + -21

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

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 = -30
2X = -30

Divide each side by '2'.
X = -15

Simplifying
X = -15

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