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2/7 + 1/4 = 8/28 + 7/28 = 15/28

f (x) = 1 - 4 x

f ( - 3 ) = 1 - 4 *-3 = 1 + 12 = 13

( 1 + 2/3) : ( 1 - 1/6 )

=  5/3 : 5/6

= 5/3 * 6/5

= 30/15 = 2

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