Help me, if you help me get this right ill make you a brainlest!///
Answer:
B and C
Step-by-step explanation:
Just add like terms. In this case, the parentheses don't matter.
8x+(x+7)+3x=
9x+7+3x=
12x+7
^This is option C. However, option B also works.
8x+7+4x=
12x+7