The two adjacent sides of a Rectangle are (a - 3b) and (b + 6a). Find its perimeter.
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sides of rectangle are = ( a-3b ) and ( b+6a )
perimeter = 2 × ( l +b )
perimeter = 2 × ( a -3b + b + 6a )
perimeter = 2 × ( 7a - 2b )
perimeter = 14a - 4b
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