21d+90=115

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Solution for 21d+90=115 equation: 



21d+90=115

We move all terms to the left:

21d+90-(115)=0

We add all the numbers together, and all the variables

21d-25=0

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

21d=25

d=25/21

d=1+4/21

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