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x in (-oo:+oo)
(3*x)/a-1 = 2 // - 2
(3*x)/a-2-1 = 0
3*a^-1*x-3 = 0 // + 3
3*a^-1*x = 3 // : 3*a^-1
x = 3/(3*a^-1)
x = a
x = a
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