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