вынесете за скобки общий множитель: 10а-5в-15с,
9а-6в+12с-15
-12х-8у+20
-14х+7у+21х-35
6ху-12х+9хz
-8ав-20ас+16а
-15а+10в-35с+20
-5ав+3ас-7а
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