Question

решить уравнение 2/3/ (Х*4/9 - 4/9)+1/20=4/5

Answer 1

2/3:4/9х-4/9+1/20=4/5
(4/9х-4/9+1/20)4/5=2/3
((4/9)х-4/9+1/20)2/5=1/3
(8/45)х-8/45+1/50=4/5
(8/45)х=8/45-1/50+4/5
(8/45)х=(400-45+450)/2250
(8/45)х=905/2250
х=(905/2250)*45/8
x=2,2625

Answer 2

23:(x49-49)+120=45
23:(49x-49)=45-120
23:(49x-49)=1620-120
23:(49x-49)=34
49x-49=23:34=23*43=89
49x=89+49
49x=129
x=129:49=129*94=10836=3
x=3