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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