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precio lapicero=x----------------------------------0,50
He pagado 3 euros por 3 lapiceros y dos bolígrafos
3(x)+2(x+0,25) =3
3x +2x + 0,50 =3
5x =3 -0,50
5x=2,50
x=2,50 / 5
x= 0,50
comprobacion
3(0,50)+2(0,75)=3
1,50 + 1,50=3
3 = 3