21-3x=3x

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Solution for 21-3x=3x equation:


Simplifying
21 + -3x = 3x

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

Combine like terms: -3x + -3x = -6x
21 + -6x = 3x + -3x

Combine like terms: 3x + -3x = 0
21 + -6x = 0

Add '-21' to each side of the equation.
21 + -21 + -6x = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -6x = 0 + -21
-6x = 0 + -21

Combine like terms: 0 + -21 = -21
-6x = -21

Divide each side by '-6'.
x = 3.5

Simplifying
x = 3.5

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