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a*(x/3)-(5*a)+4*a-(a*(x/5))+1 = 0
a*(x/3)-5*a+4*a-(a*(x/5))+1 = 0
2/15*a*x-a+1 = 0 // - 1-a
2/15*a*x = -(1-a) // : 2/15*a
x = (-(1-a))/(2/15*a)
x = 15/2*a^-1*(a-1)
x = 15/2*a^-1*(a-1)
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