А)
(2х+3)/7 - 1 = (5х-6)/2 - х,
2*(2х+3)/14 - 14 = 7*(5х-6)/14 - 14х,
(4х+6-14-35х+42+14х) / 14 = 0,
-17х + 34 = 0,
-17х = -34,
х = 2,
б)
(7х-1)/5 = 6 + (3х-7)/2,
2*(7х-1) = 6*10 + 5*(3х-7),
14х-2-60-15х+35 = 0,
-х - 27 = 0,
х = -27,
в)
(7∧5)∧3 / 49*7∧14 = 7∧15 / 7∧16 = 7∧(-1) (или 1/7),
г)
(5∧6)∧3*125 / (5∧7)∧3 = 5∧18*5∧3 / 5∧21 = 5∧21 / 5∧21 = 1,