8,3х+2х-60,5=300
и
(1,65-0,3х):0,34=4,5

10,3х-60,5=30010.3х=300+60,510,3х=360,5х=360,5:10.3Х=35(1,65-0.3Х):0,34=4,51,65-0.3х=4,5*0,341,65-0,3х=1,53-0,3х=1,65-1,53-0,3х=0.12х=0,12:(-0,3)х=-0,4