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2b = 3l
2l = b + 5
czyli b = 2l-5
2(2l-5) = 3l
4l - 10 =3l
l = 10kg
b= 15kg
y - waga lisa
x = 2y - 5
2x = 3y
x = 2y - 5
2(2y - 5) = 3y
x = 2y - 5
4y - 10 = 3y
x = 2y - 5
4y - 3y = 10
x = 2 * 10 - 5
y = 10
x = 20 - 5
y = 10
x = 15
y = 10
Borsuk waży 15 kg, a lis 10.