katyafink98 (5,4у+8,3)*2,1=23,1
11.34y +  17.43=23.1
11.34y=23.1-17.43
11.34y=5.67
y=0.5

маша0077 11,34У+17,43=23.1
11.34у=23.1-17.34=5.67
у=5.67:11.34=0.5