4d x d x d = 4d3
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4d + 7 = -15 so 4d = -22 so that d = -5.5
The D stands for the width, shoes come in diferent widths and lengths. They come in D to 4D, 4D being wider.
Without further information, all we can do is simplify: 4c + 4d = 4(c + d)
2,4-dichlorophenoxyacetic acid (2,4-D)
They are a, a+d, a+2d, a+3d and a+4d where a is the starting value and d is the common difference.