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tinggi = (2x - 2) cm
luas segitiga = 1/2 × panjang × tinggi
luas = 1/2 × (5x + 3) × (2x - 2)
= 1/2 × (5x + 3) × 2(x - 1) cm^2
= (5x + 3) (x - 1)
= 5x^2 - 2x - 3 cm^2