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-15+35=20
20+0=20
2X +35 = Y (2)
X+ Y = 20
X + 2X + 35 = 20
3X = 20- 35
3X = - 15
X = - 15/3
X = - 5
2X +35 = Y
2(-5) + 35 = Y
-10 + 35 = Y
25 = Y
¿que numero pense?
En - 5 y 25