3x+9=21x

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Solution for 3x+9=21x equation:


Simplifying
3x + 9 = 21x

Reorder the terms:
9 + 3x = 21x

Solving
9 + 3x = 21x

Solving for variable 'x'.

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

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

Combine like terms: 3x + -21x = -18x
9 + -18x = 21x + -21x

Combine like terms: 21x + -21x = 0
9 + -18x = 0

Add '-9' to each side of the equation.
9 + -9 + -18x = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -18x = 0 + -9
-18x = 0 + -9

Combine like terms: 0 + -9 = -9
-18x = -9

Divide each side by '-18'.
x = 0.5

Simplifying
x = 0.5

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