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f(b) = 1/2 (b+3) = 4
= 1/2b + 3/2 = 4
= 1/2b = 4/1 - 3/2
= 1/2b = 8/2 - 3/2 (disamakan penyebutnya)
= 1/2b = 5/2
= b = 5/2 x 2/1
= b = 5