Given \( (2+6+10+14+\ldots+2 a)+(2+6+10+14+\ldots+ \) \( 2 b)=(2+6+10+14+\ldots+2 c) \), where \...

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Given \( (2+6+10+14+\ldots+2 a)+(2+6+10+14+\ldots+ \)
\( 2 b)=(2+6+10+14+\ldots+2 c) \), where \( a+b+c=21 \) and \( a6 \). Then \( a-b \) is equal to
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