15-x-9=21

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Solution for 15-x-9=21 equation:


Simplifying
15 + -1x + -9 = 21

Reorder the terms:
15 + -9 + -1x = 21

Combine like terms: 15 + -9 = 6
6 + -1x = 21

Solving
6 + -1x = 21

Solving for variable 'x'.

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

Add '-6' to each side of the equation.
6 + -6 + -1x = 21 + -6

Combine like terms: 6 + -6 = 0
0 + -1x = 21 + -6
-1x = 21 + -6

Combine like terms: 21 + -6 = 15
-1x = 15

Divide each side by '-1'.
x = -15

Simplifying
x = -15

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