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5x-4y=3
8x+4y=36
5x-4y=3
13x=39
x=3
x=3
2x+y=9
6+y=9
y=3
x=3
y=3
{5x-4y=3
8x+4y=36
5x-4y+3
13x=39 |:13
x=3
2*3+y=9
x=3
6+y=9
x=3
y=9-6
x=3
y=3
x=3
5x-4y=3
8x+4y=36
5x-4y=3
+-----------
13x=19 ||13
x=3
Obl. y
2x+y=9
2*3+y=9
6+y=9
y=9-6
y=3