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8y=483,5
8y=14/:8
y=1,75
5/6=1+t/10
6*(1+t)=5*10
6+6t=50
6t=50-6
6t=42 /:6
t=7
1/z-1=6,5/8
6,5(z-1)=8*1
6,5z-6,5=8
6,5z=8+6,5
6,5z=14,5 /:6,5
z=2,23