3X-12=X+21

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Solution for 3X-12=X+21 equation:


Simplifying
3X + -12 = X + 21

Reorder the terms:
-12 + 3X = X + 21

Reorder the terms:
-12 + 3X = 21 + X

Solving
-12 + 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.
-12 + 3X + -1X = 21 + X + -1X

Combine like terms: 3X + -1X = 2X
-12 + 2X = 21 + X + -1X

Combine like terms: X + -1X = 0
-12 + 2X = 21 + 0
-12 + 2X = 21

Add '12' to each side of the equation.
-12 + 12 + 2X = 21 + 12

Combine like terms: -12 + 12 = 0
0 + 2X = 21 + 12
2X = 21 + 12

Combine like terms: 21 + 12 = 33
2X = 33

Divide each side by '2'.
X = 16.5

Simplifying
X = 16.5

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