Решите плес (6.227-3х): 0.08+16.4=90

(6,227-3х)+0,8+16,4=90
(6227/1000 - 3х) : 2/25 + 82/5 = 90
(6227/1000-3х) * 25/2 + 82/5 = 90
6227/80 - 75/2х + 82/5 =90
7539/80 - 75/2х = 90
7539 - 3000х = 7200
-3000х -7200 - 7539
-3000х = -339
х = -3000: (-339)
х = 113/1000 
x = 0,113

(6,227-3х):0,08+16,4=90
(6,227-3х):0,08=90-16,4
(6,227-3х):0,8=73,6
6,227-3х=73,6•0,8
6,227-3х=58,88
3х=6,227-58,88
3х=-52,653
х=-17,551