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5/a-(x/9) = 0
5*a^-1-1/9*x = 0 // - 5*a^-1
-1/9*x = -(5*a^-1) // : -1/9
x = (-(5*a^-1))/(-1/9)
x = 45*a^-1
x = 45*a^-1
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