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y=edad del hermano 2
x-y=2
x=2+y
x+y<20
2+y+y<20
2+2y<20
2y<20-2
2y<18
y<18/2
y<9
Comprobando
x=2+y
x=2+9
x=11
x-y=2
11-9=2
2=2