9x-15-3x=-21

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


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

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

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

Solving
-15 + 6x = -21

Solving for variable 'x'.

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

Add '15' to each side of the equation.
-15 + 15 + 6x = -21 + 15

Combine like terms: -15 + 15 = 0
0 + 6x = -21 + 15
6x = -21 + 15

Combine like terms: -21 + 15 = -6
6x = -6

Divide each side by '6'.
x = -1

Simplifying
x = -1

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