3X+3=X+21

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


Simplifying
3X + 3 = X + 21

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

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

Solving
3 + 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.
3 + 3X + -1X = 21 + X + -1X

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

Combine like terms: X + -1X = 0
3 + 2X = 21 + 0
3 + 2X = 21

Add '-3' to each side of the equation.
3 + -3 + 2X = 21 + -3

Combine like terms: 3 + -3 = 0
0 + 2X = 21 + -3
2X = 21 + -3

Combine like terms: 21 + -3 = 18
2X = 18

Divide each side by '2'.
X = 9

Simplifying
X = 9

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