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KΔ sama sisi = (5x - 9)
s = (x + 4)
Dit: x....?
KΔ sama sisi = 3 s
(5x - 9) = 3 ( x + 4)
5x - 9 = 3x + 12
5x - 3x = 12 + 9
2x = 21
x = 21/2
x = 10,5 cm