6x+3x=-3x-21

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


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

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

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

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

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

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

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

Simplifying
x = -1.75

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