4=1/9a

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Solution for 4=1/9a equation: 


a in (-oo:+oo)

4 = (1/9)*a // - (1/9)*a

4-((1/9)*a) = 0

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

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

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

a = -4/(-1/9)

a = 36

a = 36

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