6X-9=3X+21

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Solution for 6X-9=3X+21 equation:


Simplifying
6X + -9 = 3X + 21

Reorder the terms:
-9 + 6X = 3X + 21

Reorder the terms:
-9 + 6X = 21 + 3X

Solving
-9 + 6X = 21 + 3X

Solving for variable 'X'.

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

Add '-3X' to each side of the equation.
-9 + 6X + -3X = 21 + 3X + -3X

Combine like terms: 6X + -3X = 3X
-9 + 3X = 21 + 3X + -3X

Combine like terms: 3X + -3X = 0
-9 + 3X = 21 + 0
-9 + 3X = 21

Add '9' to each side of the equation.
-9 + 9 + 3X = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 3X = 21 + 9
3X = 21 + 9

Combine like terms: 21 + 9 = 30
3X = 30

Divide each side by '3'.
X = 10

Simplifying
X = 10

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