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x in (-oo:+oo)
(3*x)/a = b // - b
(3*x)/a-b = 0
3*a^-1*x-b = 0 // + b
3*a^-1*x = b // : 3*a^-1
x = b/(3*a^-1)
x = b/(3*a^-1)
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