66-15-x=9

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Solution for 66-15-x=9 equation: 


Simplifying
66 + -15 + -1x = 9

Combine like terms: 66 + -15 = 51
51 + -1x = 9

Solving
51 + -1x = 9

Solving for variable 'x'.

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

Add '-51' to each side of the equation.
51 + -51 + -1x = 9 + -51

Combine like terms: 51 + -51 = 0
0 + -1x = 9 + -51
-1x = 9 + -51

Combine like terms: 9 + -51 = -42
-1x = -42

Divide each side by '-1'.
x = 42

Simplifying
x = 42

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