Знайти загальні розв’язки рівнянь: а) y′′ + 6y′ − 6y = 0;

б) y′′ + 4y′ + 8y = 0;

в) y′′ + 2y′ + y = 0;

г) y′′ − 8y′ + 15y = 0.
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