(x+20,3+18,7+41,8):4=26,5
(80,8+x):4=26,5
80,8+x=26,5*4
80,8+x=106
x=106-80,8
x=25,2
<span>4/9*(9/2y-3/2)-2/7*(7/6-7/2y)=4/9*9/2у-4/9*3/2-2/7*7/6+2/7*7/2у=2у-2/3-1/3+у=3у-1</span>