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6x-4 + 2x+10 = 38
8x + 6 = 38
8x = 32
x = 4
jika lebar x+5
jadi, 4+5
jadi lebar persegi 9cm
keliling = 2(panjang+lebar)
38 = 2 (3x-2 + x+5)
38 = 2 (4x + 3)
38 = 8x + 6
38-6 = 8x
32 = 8x
32 : 8 = x
4 = x
lebar = x + 5
lebar = 4+5
lebar = 9