21-3=3x

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Solution for 21-3=3x equation:


Simplifying
21 + -3 = 3x

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

Solving
18 = 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.
18 + -3x = 3x + -3x

Combine like terms: 3x + -3x = 0
18 + -3x = 0

Add '-18' to each side of the equation.
18 + -18 + -3x = 0 + -18

Combine like terms: 18 + -18 = 0
0 + -3x = 0 + -18
-3x = 0 + -18

Combine like terms: 0 + -18 = -18
-3x = -18

Divide each side by '-3'.
x = 6

Simplifying
x = 6

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