Question

1-x/5=3-x/4; решите уравнение дробное

Answer 1

1-х/5=3-х/4
1-4х/20=3-5х/20
20-4х=60-5х
-4х+5х=60-20
х=40

Answer 2

(1-x)/5=(3-x)/4
(1-х)*4=(3-х)*5
4-4х=15-5х
-4х+5х=15-4
х=11

или:
(1-x)/5=(3-x)/4
(4-4х)/20=(15-5х)/20
(4-4х-15+5х)/20=0
4-4х-15+5х=0
х-11=0
х=11