9+a/-20=10

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Solution for 9+a/-20=10 equation: 


a in (-oo:+oo)

a/(-20)+9 = 10 // - 10

a/(-20)-10+9 = 0

-1/20*a-1 = 0 // + 1

-1/20*a = 1 // : -1/20

a = 1/(-1/20)

a = -20

a = -20

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