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4x = 3*5
4x = 15
4x = 3,75
b) 4/5 = 12/y
4y = 5*12
4y = 60
y = 15
c) 4/10 = 102/z
4z = 102*10
4z = 1020
z = 255
d) 2/7 = 10/k
2k = 7*10
2k = 70
k = 35