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The surface area of a rectangular prism is calculated using the formula:
Surface Area = 2lw + 2lh + 2wh
Given that the length is 6 cm, the height is 4 cm, and the surface area is unknown, we can set up the equation as:
2(6)(w) + 2(6)(4) + 2(4)(w) = Surface Area
12w + 48 + 8w = Surface Area
20w + 48 = Surface Area
Since the surface area value is missing, we cannot calculate the exact missing width without knowing the value of the surface area.