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