7d+3=4d+12

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Solution for 7d+3=4d+12 equation: 



7d+3=4d+12

We move all terms to the left:

7d+3-(4d+12)=0

We get rid of parentheses

7d-4d-12+3=0

We add all the numbers together, and all the variables

3d-9=0

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

3d=9

d=9/3

d=3

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