40 + y = - 12
y = - 12 - 40
y = - 52
Comprobación
40 + ( - 52) = - 12
40 - 50 = - 12
- 12 = - 12
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40 + y = - 12
y = - 12 - 40
y = - 52
Comprobación
40 + ( - 52) = - 12
40 - 50 = - 12
- 12 = - 12