Here's an explanation! :)
Answer:
-5
Step-by-step explanation:
3x+7=-8
3x+7-7=-8-7
3x=-15
3x/3=-15/3
x= -5
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= 4a + 3c + 13
(9+4a)+(4+3c)
= 9 + 4a + 4 + 3c