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3x +7 = -11
3x = -11 -7
3x = -18
x= -18/3
x = -6
Saludos :D
x . 3 = - 11 - 7
x .3 = - 18
x = -18 : 3 =
x = - 6
El número es -6
Para comprobar que la ecuación está bien:
- 6 . 3 + 7 =
- 18 + 7 =
- 11