5/7
Пошаговое объяснение:
(х+1/7)-4/7=2/7;
х+1/7=4/7+2/7;
х+1/7=6/7;
х=6/7-1/7;
х=5/7
x = 5/7
x+1/7-4/7=2/7
x-3/7=2/7
x=2/7+3/7
x=5/7
