Решите пример и с ОБЪЯСНЕНИЕМ ПОЖАЛУЙСТА!!! даю 30 баллов -2x+3x-5x=
(2a-5)-(7-2a+4)=
-4*(1,5c-1)+3(c-5)=
2a-3b-5a+7b=
4*(3x-y)-5*(x+y)=
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