3c - 4d = 6d + 4c
Subtract 4c from both sides: -c - 4d = 6d
Add 4d to both sides: -c = 10d
or c = - 10d
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Without further information, all we can do is simplify: 4c + 4d = 4(c + d)
4d + 7 = -15 so 4d = -22 so that d = -5.5
4d is time...any moving object is 4d
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there is no 4d known to man