Answer:
B 8(r + t)
Explanation:
We must evaluate the equation in order to get the answer
12(r + t) - 6(r + t) + 4(r + t) - 2(r + t)
6(r + t) + 4(r + t) - 2(r + t)
10(r + t) - 2(r + t )
8(r + t)
The answer is B
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