d+3d-45=75

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Solution for d+3d-45=75 equation: 



d+3d-45=75

We move all terms to the left:

d+3d-45-(75)=0

We add all the numbers together, and all the variables

4d-120=0

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

4d=120

d=120/4

d=30

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