3х + 5у = 72у - х = 5
-----------------
х = 2у - 5
3(2у - 5) + 5у = 7
------------------
6у - 15 + 5у = 7
--------------------
11у = 22
----------------
у = 2
х = 2 * 2 - 5
х = -1
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3х + 5у = 7
2у - х = 5
-----------------
х = 2у - 5
3(2у - 5) + 5у = 7
------------------
х = 2у - 5
6у - 15 + 5у = 7
--------------------
х = 2у - 5
11у = 22
----------------
у = 2
х = 2 * 2 - 5
-----------------
у = 2
х = -1