Odpowiedź:
a)
x/7 = 4/5
5 • x = 4 • 7
5x = 28
x = 28/5 = 5 3/5
b)
(x - 2)/5 = x/6
6 (x - 2) = 5x
6x - 12 = 5x
6x - 5x = 12
x = 12
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