(98:14+х-9:24)х40=480
98:14+х-9:24=480/40
7+х-3/8=12
х=12-7+3/8
х=5 цел 3/8
..................
(98:14+х-9/24)*40=4807+х-0,375=480:40х+6,625=12х=12-6,625х=5,375