При каких значениях а неравенства верны?

1) a(52 + 73) = 8 * 52 + 8 * 73

2) 3a + 7a = 9 * 21

3) 23* a+41* a=(23+41)*19

4) 48a - 33a = (48 - 33) * 28 .
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