допоможіть вирішити
1) a+5 20a
____ + ____ =
a-5 25-a²
2) 2х 2х+12
_______ - _____ =
х²-6х+9 х²-9
3) 6a 21 6a²
____ - ___ +____ =
a-7 a+7 49-a²
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