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Revenind,
x+y=45 => (2*y)/3+y=45 => y=3*45/5 => y=27
=> x=18
b /....../...../..../ )
45=5 p.e
45 :5=9 (a:2)
9x2=18 (a)
9:3=3 ( b : 3)
3x6=18 (b)