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8x=9(x-20)
8x=9x-180
x=180 [cm]
x-20=160 [cm]
x-20- wzrost niższej osoby
9/8= x/ x-20
8x= 9x- 180/-9x
-x=-180/:-1
x=180
180-20=160
Odp; Niższa osoba ma 160cm wzrostu.