1)X-4=12
X=16
Comprobación
16-4=12
2)9x-4=14
9x=18
x=2
Comprobacion
9(2)-4=18-4=14
3)-2x=-14
x=-14/-2
x=7
- 2(7)=-14
- 14=-14
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Analizamos
1)X-4=12
X=16
Comprobación
16-4=12
2)9x-4=14
9x=18
x=2
Comprobacion
9(2)-4=18-4=14
3)-2x=-14
x=-14/-2
x=7
Comprobacion
- 2(7)=-14
- 14=-14