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30 = 2x + 2x + 5 + 5x - 2
30 = 9x + 3
30-3 = 9x
27 = 9x
27:9 = x
3 = x
sisi a = 2x = 2(3) = 6 cm
sisi b = 2x + 5 = 2(3) + 5 = 6 + 5 = 11 cm
sisi c = 5x - 2 = 5(3) - 2 = 15-2 = 13 cm (terpanjang)
2x cm +2x cm+5 cm+5x cm-2cm = 30 cm
2x cm+2x cm+5x cm+5 cm-2 cm =30 cm
9x cm + 3 cm = 30 cm
9x cm = 30 -3
9x cm = 27 cm
x = 27 cm/9 cm
x= 3
2x= 2(3)= 6
2x+5 = 2(3)+5 = 6+5 = 11
5x-2 = 5(3)-2 = 15-2 =13
jadi sisi terpanjang adlah 5x-2 = 5(3)-2 = 15-2 =13