3x+9=x+21

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Solution for 3x+9=x+21 equation:


Simplifying
3x + 9 = x + 21

Reorder the terms:
9 + 3x = x + 21

Reorder the terms:
9 + 3x = 21 + x

Solving
9 + 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.
9 + 3x + -1x = 21 + x + -1x

Combine like terms: 3x + -1x = 2x
9 + 2x = 21 + x + -1x

Combine like terms: x + -1x = 0
9 + 2x = 21 + 0
9 + 2x = 21

Add '-9' to each side of the equation.
9 + -9 + 2x = 21 + -9

Combine like terms: 9 + -9 = 0
0 + 2x = 21 + -9
2x = 21 + -9

Combine like terms: 21 + -9 = 12
2x = 12

Divide each side by '2'.
x = 6

Simplifying
x = 6

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