2X-21=30-X

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Solution for 2X-21=30-X equation:


Simplifying
2X + -21 = 30 + -1X

Reorder the terms:
-21 + 2X = 30 + -1X

Solving
-21 + 2X = 30 + -1X

Solving for variable 'X'.

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

Add 'X' to each side of the equation.
-21 + 2X + X = 30 + -1X + X

Combine like terms: 2X + X = 3X
-21 + 3X = 30 + -1X + X

Combine like terms: -1X + X = 0
-21 + 3X = 30 + 0
-21 + 3X = 30

Add '21' to each side of the equation.
-21 + 21 + 3X = 30 + 21

Combine like terms: -21 + 21 = 0
0 + 3X = 30 + 21
3X = 30 + 21

Combine like terms: 30 + 21 = 51
3X = 51

Divide each side by '3'.
X = 17

Simplifying
X = 17

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