21+6x+3=15+3x-9x-9

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Solution for 21+6x+3=15+3x-9x-9 equation:


Simplifying
21 + 6x + 3 = 15 + 3x + -9x + -9

Reorder the terms:
21 + 3 + 6x = 15 + 3x + -9x + -9

Combine like terms: 21 + 3 = 24
24 + 6x = 15 + 3x + -9x + -9

Reorder the terms:
24 + 6x = 15 + -9 + 3x + -9x

Combine like terms: 15 + -9 = 6
24 + 6x = 6 + 3x + -9x

Combine like terms: 3x + -9x = -6x
24 + 6x = 6 + -6x

Solving
24 + 6x = 6 + -6x

Solving for variable 'x'.

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

Add '6x' to each side of the equation.
24 + 6x + 6x = 6 + -6x + 6x

Combine like terms: 6x + 6x = 12x
24 + 12x = 6 + -6x + 6x

Combine like terms: -6x + 6x = 0
24 + 12x = 6 + 0
24 + 12x = 6

Add '-24' to each side of the equation.
24 + -24 + 12x = 6 + -24

Combine like terms: 24 + -24 = 0
0 + 12x = 6 + -24
12x = 6 + -24

Combine like terms: 6 + -24 = -18
12x = -18

Divide each side by '12'.
x = -1.5

Simplifying
x = -1.5

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