4+9d=7d

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Solution for 4+9d=7d equation: 



4+9d=7d

We move all terms to the left:

4+9d-(7d)=0

We add all the numbers together, and all the variables

2d+4=0

We move all terms containing d to the left, all other terms to the right

2d=-4

d=-4/2

d=-2

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