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8x - 28 + 3x + 5 = 3x + 9
8x + 3x - 3x = 9 + 28 - 5
8x = 32
x = 32/8
x = 4 cm
= 8x - 28 + 3x + 5 = 3x + 9
= 8x - 28 + 3x + 5 - 3x - 9 = 0
= 8x - 32 = 0
8x = 32
x = 32/8 = 4