Кто поможет тот пацан!

1) Упростите упражнение:
( y - 4 )( y+3 ) + ( y + 1 )² - ( 7 - y )( y + 7 )

2) Разложите на множители:
а) 21a²b+28ab²
б) 36m²-100n
в) 125+a³b³
г) 5x³-5xy²
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