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4x-3+3 = 2x + 5 + 3
4x = 2x + 8
4x - 2x = 2x - 2x + 8
2x = 8
x = 8/2 = 4
panjang sisi
2x+5
= 2 x 4 + 5
=8 + 5 = 13 cm