3*9-x=15

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Solution for 3*9-x=15 equation: 


Simplifying
3 * 9 + -1x = 15

Multiply 3 * 9
27 + -1x = 15

Solving
27 + -1x = 15

Solving for variable 'x'.

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

Add '-27' to each side of the equation.
27 + -27 + -1x = 15 + -27

Combine like terms: 27 + -27 = 0
0 + -1x = 15 + -27
-1x = 15 + -27

Combine like terms: 15 + -27 = -12
-1x = -12

Divide each side by '-1'.
x = 12

Simplifying
x = 12

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