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y - druga liczba
x+y=10
x-y=-30
x=10-y
x-y=-30
x=10-y
10-y-y=-30
x=10-y
-2y=-30-10
x=10-y
-2y=-40 /:(-2)
x=10-y
y=20
x=10-20
y=20
x=-10
y=20
Odp. Te liczby to -10 i 20.