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2x+3y=18/•7
-14x+22y=44
14x+21y=126
----------------
43y=170/:43
y=3całe i (w ułamku) 41 przez 43
2x+3y=18 /×7
-14x+22y=44
14x+21y=126
43y=170 /:43
y=170:43≈4
x≈3