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3x+15y=22290 ]-[ 14x-7y=32564
3 x + 15 y = 22 290 / : 3
14 x - 7 y = 32 564 / : 7
-------------------------
x + 5 y = 7 430
2 x - y = 4 652
------------------------
x = 7 430 - 5 y
2*( 7 430 - 5 y) - y = 4 652
--------------------------------
14 860 - 11 y = 4 652
-----------------------------
11 y = 14 860 - 4 652
11 y = 10 208 / : 11
y = 928
=======
x = 7 430 - 5*928
x = 7 430 - 4 640
x = 2 790
============
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3 x + 15 y = 22 290 / : 3
14 x - 7 y = 32 564 / : 7
-------------------------
x + 5 y = 7 430
2 x - y = 4 652
------------------------
x = 7 430 - 5 y
2*( 7 430 - 5 y) - y = 4 652
--------------------------------
x = 7 430 - 5 y
14 860 - 11 y = 4 652
-----------------------------
11 y = 14 860 - 4 652
11 y = 10 208 / : 11
y = 928
=======
x = 7 430 - 5*928
x = 7 430 - 4 640
x = 2 790
============