х- 87 - 27- 36 = 0
х - 150 = 0
х = 150
проверка
(150 - 87) - 27 = 36
36 = 36
х-87=36+27
х-87=63
х=87+63
х=150
(150-87)-27=36
150-87=63
63-27=36,верно
х- 87 - 27- 36 = 0
х - 150 = 0
х = 150
проверка
(150 - 87) - 27 = 36
36 = 36
х-87=36+27
х-87=63
х=87+63
х=150
(150-87)-27=36
150-87=63
63-27=36,верно