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3*7=5x
21=5x________/:5
x=4,2
8/3,=4/y
8y=4*3
8y=12________/:8
y=1,5
5/6=1+t/10________/*60
50=60+6t_________/-60
6t=-10__________/:6
t=-10/6
5x = 21
x = 21/5
b.) 8/3 = 4/y
8y = 12
y = 12/8 = 3/2
c.) 5/6 = 1 + t/10
-1/6 = t/10
6t = -10
t = - 10/6