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Rozwiąż układy równań metodą podstawiania:
a) x+3y=3
x-y=5
b)2x-y=10
x+5y=-17
c)3m+n=9
2m-5n=-11
d)4a-2=b
3a+7b=1,5
e)5x=4-2y
4x+y=3
f) 6x-3y=9
x+5y=-9,5
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