(318+х) -209 = 318 + x -209 = 318 - 209 + x = 109 + x
(436+у) -186 = 436 + y -186 = 436 - 186 + y = 250 + y
х-187+379 = x - 187 + 379 = x + 379 - 187 = x + 192
а-426+550 = a - 426 + 550 = a + 550 - 426 = a + 124
(318+х) -209 = 318 + x -209 = 318 - 209 + x = 109 + x
(436+у) -186 = 436 + y -186 = 436 - 186 + y = 250 + y
х-187+379 = x - 187 + 379 = x + 379 - 187 = x + 192
а-426+550 = a - 426 + 550 = a + 550 - 426 = a + 124