2a(5a-7)-5a(3-2a)
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2a(5a-7)-5a(3-2a) = 10a^2-14a-15a+10a^2= 20a^2-29
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2a(5a-7)-5a(3-2a) = 10a^2-14a-15a+10a^2= 20a^2-29
10a-14a-15a+10a
-9a