12*х+14х+42=1.2
8,1:x-0,7=1,6
4,6x+3,8x-1,6=0,5

12х+14х+42=1.226х=1.2-4226х=-40,8х=-1 37/658,1:x-0,7=1,68,1:x=1,6+0,78,1х=2,3х=23:81х=23/814,6x+3,8x-1,6=0,58,4х=2,1х=21:84х=0,25