6a-[2a²-{4a(2-a-3a²)-3(a²-2a+3)}]-7a
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Answer:
2a²
Step-by-step explanation:
6a-(2a²-(4a(2-a-3a²)-3(a²-2a+3)))-7a
6a-(2a²-(8a-2a-3a²)-(3a²-6a+9)))-7a
6a-(2a²-3a²)-(-3a²+9)-7a
6a+1a²+3a²+9-7a
-1a+1a²+3a²-2a
a+3a²-2a
-a+3a²
2a²
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