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2014-07-02T17:57:03+03:00
2/5= (x+2)/15 = 10/(3y+1)

2/5=(x+2)/15

5(x+2)=2*15
5x+10=30
5x=30-10
5x=20
x=4

2/5=10/(3y+1)

5*10=2*(3y+1)
50=6y+2
50-2=6y
48=6y
y=8