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a)
a/15 = a+8/15+6
mnożymy na krzyż
21a= 15(a+8)
21a = 15a + 120
6a = 120
a = 20
b)
4/5 = 4+b/5+3
i tak samo:
32=20+5b
5b = 32-20 = 12
b = 2,4
c )
4/8 = 4+6/c
4c = 80
c = 20