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4x+12 = 4x-6+2x+2
4x+12 = 6x-4
12+4 = 6x-4x
16 = 2x
x = 8
panjang sisi persegi = (x+3)
= 8 + 3
= 11
2s = p + l
2(x + 3) = 2x - 3 + x + 1
2x + 6 = 3x - 2
6 + 2 = 3x - 2x
x = 8
s = x + 3
= 8 + 3 = 11cm
p = 2x - 3
= 2(8) - 3
= 16 - 3 = 13 cm
l = x + 1
= 8 + 1 = 9 cm