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a in (-oo:+oo)
(1/5)*a-(6*a)-1 = -83/25 // + -83/25
(1/5)*a-(6*a)-(-83/25)-1 = 0
(1/5)*a-6*a+83/25-1 = 0
58/25-29/5*a = 0 // - 58/25
-29/5*a = -58/25 // : -29/5
a = -58/25/(-29/5)
a = 2/5
a = 2/5
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