Answer: 5
Step-by-step:
1. set up equations : 4x+12=8 and 2x+7=?
2. solve for x in the first eq.
4x + 12 = 8
4x = -4
x = -1
3. plug x = -1 into 2x+7=?
2 ( -1 ) + 7 =
-2 + 7 =
5
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