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x * 10 - 1 : 3 = 6 /*3
30x - 1 = 18
30x = 19 /:30
x = 0,63
Podstawiam do drugiego:
0,63(10 - 1 : 3 ) = 0,63 * 9,67 = 6,09
Do trzeciego
10 * 6,09 = 60,9
I do czwartego
60,9 : 3 = 20,3