-20-(-15)=x/9

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Solution for -20-(-15)=x/9 equation: 


x in (-oo:+oo)

15-20 = x/9 // - x/9

15-(x/9)-20 = 0

-1/9*x-5 = 0 // + 5

-1/9*x = 5 // : -1/9

x = 5/(-1/9)

x = -45

x = -45

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