21+9x=12+4x

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Solution for 21+9x=12+4x equation:


Simplifying
21 + 9x = 12 + 4x

Solving
21 + 9x = 12 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
21 + 9x + -4x = 12 + 4x + -4x

Combine like terms: 9x + -4x = 5x
21 + 5x = 12 + 4x + -4x

Combine like terms: 4x + -4x = 0
21 + 5x = 12 + 0
21 + 5x = 12

Add '-21' to each side of the equation.
21 + -21 + 5x = 12 + -21

Combine like terms: 21 + -21 = 0
0 + 5x = 12 + -21
5x = 12 + -21

Combine like terms: 12 + -21 = -9
5x = -9

Divide each side by '5'.
x = -1.8

Simplifying
x = -1.8

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