21=3+9x

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Solution for 21=3+9x equation:


Simplifying
21 = 3 + 9x

Solving
21 = 3 + 9x

Solving for variable 'x'.

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

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

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

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

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

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

Divide each side by '-9'.
x = 2

Simplifying
x = 2

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