Развязать 2 уравнение (х: 12)*144-712=13688 (7290: х)*75+100=60850

(7290:х)*75+100=60850
(7290:х)*75 = 60850 - 100
(7290:х)*75 = 60750
7290 : х = 60750 : 75
7290 : х = 810
х = 7290 : 810
х = 9
(х:12)*144-712=13688
(х:12)*144 = 13688 + 712
(х:12)*144 = 14400
х:12 = 14400 :144
х:12 = 100
х = 100 * 12
х = 1200