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f(k) = 11
-2k + 7 = 11
-2k = 11 -7
-2k = 4
k = 4/-2 = -2
f(k) = 11
-2x +7 = 11
-2x =11-7
-2x= 4
x= 4/-2
x= -2
(k) = -2(-2) + 7 = 11