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f(3) = (3 +2m) (3) +7 = 28
= 9 +6m +7 = 28
= 6m = 28 -9 -7
= 6m = 12
= m = 12/6
= m = 2
Maka, f(x) = (3 +2(2))x +7
f(x) = (3 +4)x +7
f(x) = 7x +7
f(x) = 7x +7
f(-5) = 7(-5) +7
= -35 +7
= -28
Itu jawabannya.