(3,48-3y): 0,07+0,42: 0,007=72,24 !

(3,48-3y):0,07+0,42:0,007=72,24; (3,48-3у):0,07+60=72,24; (3,48-3у):0,07=72,24-60; 3,48-3у=12,24*0,07; -3у=0,8568-3,48; -3у=-2,6232; у=2,6232:3; у=0,8744