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The area of a rectangle is 5x³+19x²+6x-18 with length x+3. Using synthetic division, what is the width of the rectangle?
a. 5x²+4x-6
b. 5x²+34x+108+ 306/x+3
c. 5x³+4x²-6x
d. 5x²+34x+108+ 306/x-3