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If \[(3x-4)(5x+7)=15{{x}^{2}}-ax-28a\] then\[a=\]?
1.
If \[(3x-4)(5x+7)=15{{x}^{2}}-ax-28a\] then\[a=\]?
A.
1
B.
\[-1\]
C.
\[-3\]
D.
4
Answer» C. \[-3\]
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