9x+21=-3x

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


Simplifying
9x + 21 = -3x

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

Solving
21 + 9x = -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 + 9x + 3x = -3x + 3x

Combine like terms: 9x + 3x = 12x
21 + 12x = -3x + 3x

Combine like terms: -3x + 3x = 0
21 + 12x = 0

Add '-21' to each side of the equation.
21 + -21 + 12x = 0 + -21

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

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

Divide each side by '12'.
x = -1.75

Simplifying
x = -1.75

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