-4=a/9

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Solution for -4=a/9 equation: 


a in (-oo:+oo)

-4 = a/9 // - a/9

-(a/9)-4 = 0

-1/9*a-4 = 0 // + 4

-1/9*a = 4 // : -1/9

a = 4/(-1/9)

a = -36

a = -36

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