Respuesta:
1. x+8=12
x=12-8
x=4
2. ×-(3)=9
×=9-3
×=12
3. 6-(-×)=32
6+×=32
×=32-6
×=26
4.7+×=21
×=21-7
×=14
5. 32=×+25
32-×=25
-×=25-32
-×=-7
×=7
6. ×-9=14
×= 14+9
×=23
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Respuesta:
1. x+8=12
x=12-8
x=4
2. ×-(3)=9
×=9-3
×=12
3. 6-(-×)=32
6+×=32
×=32-6
×=26
4.7+×=21
×=21-7
×=14
5. 32=×+25
32-×=25
-×=25-32
-×=-7
×=7
6. ×-9=14
×= 14+9
×=23