X-3x-9+2=21

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Solution for X-3x-9+2=21 equation:


Simplifying
X + -3x + -9 + 2 = 21

Reorder the terms:
-9 + 2 + X + -3x = 21

Combine like terms: -9 + 2 = -7
-7 + X + -3x = 21

Solving
-7 + X + -3x = 21

Solving for variable 'X'.

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

Add '7' to each side of the equation.
-7 + X + 7 + -3x = 21 + 7

Reorder the terms:
-7 + 7 + X + -3x = 21 + 7

Combine like terms: -7 + 7 = 0
0 + X + -3x = 21 + 7
X + -3x = 21 + 7

Combine like terms: 21 + 7 = 28
X + -3x = 28

Add '3x' to each side of the equation.
X + -3x + 3x = 28 + 3x

Combine like terms: -3x + 3x = 0
X + 0 = 28 + 3x
X = 28 + 3x

Simplifying
X = 28 + 3x

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