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3/b=5/(b+12)
mnożymy na skos
3(b+12)=5×b
3b+36=5b
36=2b
b=18
4.
x-8/x=3/4
znowu na skos
4(x-8)=3×x
4x-32=3x
x=32
ułamek - 24/32