Question

[(7+0.004x)/0.9]/24.7-12.3=77.7

Answer 1

[ (7+0.004x)/0.9] / 24.7    -   12.3 = 77.7
[ (7+0.004x)/0.9] / 24.7  = 77.7 +12.3
[ (7+0.004x)/0.9] = 90 * 24.7
(7+0.004x)/0.9 = 2223
7+0.004x  = 2223*0.9
7+0.004x=2000.7
0.004x=2000.7 -7
0.004x= 1993.7
x= 1993.7/0.004
x= 498425

Проверим:
[( 7 + 0.004 *498425 ) / 0.9 ]  / 24.7    - 12.3 =77.7
[ (7 +1993.7) /0.9]  / 24.7    -12.3 = 77.7
[2000.7/0.9 ] /24.7  -  12.3 = 77.7
2223/24.7   - 12.3 = 77.7
90-12.3=77.7
77.7=77.7