80.1у-10.1у+4.7=81.7
70у=81.7-4.7
70у=77
у=77:70
у=1.1
45.7х+0.3х-2.4=89.6
46х=89.6+2.4
46х=92
х=92:46
х=2
80.1y - 10y = 81.7 - 4.7
70.1y = 77
y = 11/10.1 = 10/11
45.7x+0.3x = 89.6 + 2.4
46x = 92
x = 2
