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b) 28 = 3x + 2x + 1 + x + 3
28 = 6x + 4
6x = 28 - 4
6x = 24
x = 4
ukuran sisi sisi
3x = 3 (4) = 12
2x + 1 = 2 (4) + 1 = 8 + 1 = 9
x + 3 = 4 + 3 = 7