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misal
2x+3 = t
2x = t-3
x =
f(2x+3) = 5x-3
f(t) = 5 - 3
f(t) = -
f(t) =
f(t) =
f(x) =
Mencari f(-1)
f(-1) =
f(-1) =
f(-1) =
f(-1) = -13