The length of a rectangular frame is represented by the expression 3x + 10, and the width of the rectangular frame is represented by the expression 3x + 6. Write an equation to solve for the width of a rectangular frame that has a total area of 192 square inches.

a
9x2 + 48x + 60 = 0

b
9x2 + 48x − 132 = 0

c
3x2 + 48x − 132 = 0

d
x2 + 16x + 60 = 0