5,3х-3,1=3,7х+3,3 5х+7=19+х

1) 5,3х-3,1=3,7х+3,35,3х-3,1-3,7х-3,3=01,6х-6,4=01,6х=6,4х=6,4:1,6=42) 5х+7=19+х5х+7-19-х=04х-12=04х=12х=12:4=3