21=9x-15

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Solution for 21=9x-15 equation:


Simplifying
21 = 9x + -15

Reorder the terms:
21 = -15 + 9x

Solving
21 = -15 + 9x

Solving for variable 'x'.

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

Add '-9x' to each side of the equation.
21 + -9x = -15 + 9x + -9x

Combine like terms: 9x + -9x = 0
21 + -9x = -15 + 0
21 + -9x = -15

Add '-21' to each side of the equation.
21 + -21 + -9x = -15 + -21

Combine like terms: 21 + -21 = 0
0 + -9x = -15 + -21
-9x = -15 + -21

Combine like terms: -15 + -21 = -36
-9x = -36

Divide each side by '-9'.
x = 4

Simplifying
x = 4

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