решите уравнение 1/3у + 5/9у= 7,2

1/3у+5/9у=7,23/9у+5/9у=36/58/9у=36/5у=36/5:8/9у=(9*9)/(5*2)у=81/10у=8,11/3*8,1+5/9*8,1=7,21/3*81/10+5/9*81/10=7,281/30+405/90=7,2243/90+405/90=7,2648/90=7,27,2=7,2