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a/b=2/3
a=2/3 b
2/3b+b=20
1 2/3b=20
b=12
a=2/3 *12
a=8
boki a=8 b=12
a- jeden bok
b - drugi bok
a + b = 20
a/ b = 3/2
a = 20 - b
2a = 3 b
a = 20 - b
2 ( 20 - b ) = 3b
a = 20 - b
40 - 2b = 3b
a = 20 - b
40 = 5b |: 5
a = 20 - b
b= 8
a = 20 - 8
b= 8
a = 12
b=8
a narysować to już chyba prosto ;)