Решите уравнения: а) 13(х-13)+14(14х-2)=11(3х-11)+28+(10х-21)
б)-15(15+у)-12(12у+1)+10=16(3у-16)-17(у+17)
в)18(18-х)-20(2х+20)-8=19(19-3х)-25(х+25)
г)-21(2х-21)+24(24-3х)-29=30(х+30)-22(-3х-22)
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