Х-246=536-168
х-246=368
х=368+246
х=614
---
627-х=234+257
627-х=491
х=627-491
х=136
---
х+153=624-265
х+153=359
х=359-153
х=206
----
356+х=537+269
356+х=806
х=806-356
х=450
-----
х-356=456+168
х-356=624
х=624+356
х=980
---
237+х=867-269
237+х=598
х=598-237
х=361