0,8*(4,7у-0,38)+40,04=45

0.8*(4.7y-0.38)+40.04=45

3.76y - 0.304 + 40.04 = 45

3.76y = 45 + 0.304 - 40.04

3.76y = 5.264

y = 5.264 / 3.76

y = 526.4 / 376

y = 1.4