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a in (-oo:+oo)
(1/5)*a-(1/5) = 12 // - 12
(1/5)*a-(1/5)-12 = 0
(1/5)*a-1/5-12 = 0
1/5*a-61/5 = 0 // + 61/5
1/5*a = 61/5 // : 1/5
a = 61/5/1/5
a = 61
a = 61
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