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x=y-8
2x=y+7
y=x+8
2x=x+8+7
x=15
x=y-8
15=y-8
y=23
comprobacion
x=15 y =23
23-15=8 asi q 15 es menor que 23 con 8
2(15)=23+7
30=30 duplo del menor es igual al mayor aumentado 7