7d+9=5d+13

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Solution for 7d+9=5d+13 equation: 



7d+9=5d+13

We move all terms to the left:

7d+9-(5d+13)=0

We get rid of parentheses

7d-5d-13+9=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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