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Verified answer

а/1,4 = 7,5/42

а=1,4*7,5:42=0,25

5/9 : х = 1/8 : 3 3/4

х=5/9 * 15/4 : 1/8 =50/3=16 2/3

(3+b)/4 = 7/2

3+b = 4*7:2

3+b=14

b=14-3=11

5/8 = 10/(3с-5)

3с-5=8*10:5

3с-5=16

3с=21

с=7