-21-(-23)=x/9

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Solution for -21-(-23)=x/9 equation: 


x in (-oo:+oo)

23-21 = x/9 // - x/9

23-(x/9)-21 = 0

2-1/9*x = 0 // - 2

-1/9*x = -2 // : -1/9

x = -2/(-1/9)

x = 18

x = 18

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