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15x=8
x=8/15
d) 1,6/4 =x/1,6
4x=2.56
x=0.64
e) x-1/2 = 3/4
4x-4=6
4x=10
x=5/2
f) 8/5 = 7/x+2
x≠-2
8x+16=35
8x=19
x=19/8=2 i 3/8