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-9x+7y=12
9x-y=6
-9x+7y =12
6y =18
y =3
3x-1/3*3 =2
3x -1 = 2
3x=3
x = 1
sprawdzam
-9*1+7*3 = 12
-9+21 =12
12 = 12
jest ok