((8/3х)+(10/7х))*21=43
21*(8/3х)+21*(10/7х)=43
56х+30х=43
86х=43
х=1/2
1/2
Пошаговое объяснение:
2 14/21x + 1 9/21x = 43 : 21
3 23/21x = 43/21
4 2/21x = 43/21
86/21x = 43/21
x = 43/21 : 86/21
x = 43/21 * 21/86
x = 43/86
x = 1/2
