dividir 105 en dos partes, una de las cuales disminuida en 20 sea igual a la otra disminuida en 15
x+y=105
x-20=y-15
x-y=20-15
x-y=5
x+y=105 +
_____
2x=110
x=55
y=50
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x+y=105
x-20=y-15
x-y=20-15
x-y=5
x+y=105 +
x-y=5
_____
2x=110
x=55
y=50