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5x+5y=17
8x-9y=19
5x+5y=17 I×3
-15x+20y=-10
15x+15y=51
35y=41
y=1 i 6/35
3x-4y=2 I×5
5x+5y=17 I×4
15x-20y=10
20x+20y=68
35x=78
x=2 i 8/35