4. Знайди корені рівняння.
а) х = -5,2;
б) х + 15 = 2;
в) 7x – 8 = 8;
г) (7х + 5) (4х – 13) = 0;
д) х(х – 20)(х – 21)(х + 20)(х + 21) = 0.
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