10d - 6 = 4d - 15 - 3d
10d - 6 = d - 15
9d = -9
d=-1
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If AC equals 6 and BD equals 4, then AB equals 5.
When equals are added to equals, you don't necessarily get wholes. But whatever you do get, they're equal.
9
The answer is 20.
47x6 equals 282.