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8y = 20 . 7
y = 140 : 8 = 17,5
17,5 : (x+10) = 7 : 10
7(x+10) = 17,5 . 10
7x +70 = 175
7x = 175 - 70
7x = 105
x = 105 : 7 = 15
10 : 8 = X: 12
x = 10(12) /(8) = 15
CE : ED = CE : CB
10 : 7 = (10+15) : y
y = 7(25)/(10)
y = 17,5