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f(x) = -3x+6
f(2) = -3(2)+6
f(2) = -6 + 6
f(2) = 0
jadi bayangannya 0
bayangan dari -3
f(x) = -3x+6
f(-3) = -3(-3)+6
f(-3) = 9+6
f(-3) = 15
jadi bayangannya 15
b. f(a) = -9
9 = -3a + 6
3a = 6-9
3a = -3
a = -3/3
a = -1