For this case we have to simplify the following expression:
![12x + 3 - 4x + 7 =](https://img.qammunity.org/2020/formulas/mathematics/middle-school/gosv2xmge3pjsms8d4lw2gnced8jzznnf4.png)
We combine similar terms:
![12x-4x + 3 + 7 =](https://img.qammunity.org/2020/formulas/mathematics/middle-school/4l6xcykzag8mj2z3uikiaxn7zigdwk5evy.png)
Taking into account that equal signs are added and the same sign is placed, and different signs are subtracted and the sign of the major is placed. So:
![8x + 10](https://img.qammunity.org/2020/formulas/mathematics/middle-school/cbdpg9k2amf47l4omgw68oh58b4r5izlbc.png)
So,
is the most simplified form.
Answer:
![8x + 10](https://img.qammunity.org/2020/formulas/mathematics/middle-school/cbdpg9k2amf47l4omgw68oh58b4r5izlbc.png)