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m = f'(x)
y=3 = 2x - 3/ x + 1
3x+3 = 2x-3
x= -6 titik singgung (-6,3)
m =[ 2(x+1) - (2x-3) ] / (x+1)²
masukin x = -6
m = 8/25
y-y1 = m (x-x1)
y-3 = 8/25(x+6) tinggal dikalikan
y = 8/25x + 8/25 . 6 + 3