1) (х+1)(х+2)=(х-3)(х+4) 2) (3х-1)(2х+7)-(х+1)(6х-5)=16 3) 24-(3у+1)(4у-5)=(11-6у)(2у-1)+6 4)(6у+2)(5-у)=47-(2у-3)(3у-1)