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x*1=14*1,5
x=21
4:x=5:9
czyli:
5x=9*4
5x=36
x=7,2
X=14: 6/5 razy 15/10=14:12/10 razy 15/10=14 razy 10/12 razy 15/10 = 140/12 razy 15/10= 700/120= 35
b)
4:x=5:9 | razy 9
4:x razy 9=5 | razy x
4 razy 9= 5x |:5
9=x
x=9