решить систему уравнений:  1.а) (х+3/2)-(у-2/3)=2         (х-1/4)+(у+1/3)=4       б) 2х/9+у/4=0           5х/12+у/3=1   2.а) х-3=5+3х        х-3=9х+1        б) у+3=2у-4             2х+3=х
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