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s×s = 2(p+l)
4 (x+5) = 2(2x-1) + (×+1))
4x + 20 = 2 (3×)
4× + 20 = 6x
4x - 6× = -20
-2x = -20
× = 10
pj sisi persegi =
=(× + 5)
=(10+5)
=15 cm