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-6=11-x
-6-11=-x
-17=-x
como ambos son negativos, tachamos el signo menos y quedan los dos positivos
17=x
8 - 4 - 10 = 12 - 1 - x
8 - 14 = 11 - x
- 6 = 11 - x
x = 11 + 6
x = 17
Solución :
x = 17