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1)3/x = 5/7
5x = 3*7
5x = 21 |:5
x = 21/5
x = 4 i 1/5
x = 4,2
2)8/3,5=4/y
8y = 4*3,5
8y = 14 |:8
y = 14/8
y = 7/4
y = 1,75
3)5/6=1+t/10
6(1+t) = 5*10
6+6t = 50
6t = 50-6
6t = 44 |:6
t = 44/6
t = 22/3
t = 7 i 1/3