4d+9=7d+12

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Solution for 4d+9=7d+12 equation: 



4d+9=7d+12

We move all terms to the left:

4d+9-(7d+12)=0

We get rid of parentheses

4d-7d-12+9=0

We add all the numbers together, and all the variables

-3d-3=0

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

-3d=3

d=3/-3

d=-1

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