решите уравнение
a) (a + 1)²– (2a + 3)² = 0;
6) (5c + 8)² – (c - 10)² = 0;
B) (3b - 2)² – (b + 1)² = 0;
1) (7d – 13)² – (9d - 25)² = 0.​
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