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x/2 = 6/4
x = 2x6/4
x = 12/4
x = 3 cm
DE/BC = AD/AB
y/10 = 6/10
y = 10x6/10
y = 60/10
y = 6 cm
10.y = 60
y = 6
6/10 = x/(x+2)
6(x+2) = 10x
12 = 10x-6x
12 = 4x
3 = x