21+3x=3x+X

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Solution for 21+3x=3x+X equation:


Simplifying
21 + 3x = 3x + X

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

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

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

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

Solving
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.
21 + -1X = X + -1X

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

Add '-21' to each side of the equation.
21 + -21 + -1X = 0 + -21

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

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

Divide each side by '-1'.
X = 21

Simplifying
X = 21

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