If EF is 17 and DF = 2 times FE plus 6, How long is DE ?

57

Explanation:

EF = FE = 17

DF = ( 2 x FE )

= ( 2 x 17 ) + 6

= 34 + 6

DF = 40

DE = DF + FE

= 40 + 17

DE = 57

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