91=2.5d+87

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Solution for 91=2.5d+87 equation: 



91=2.5d+87

We move all terms to the left:

91-(2.5d+87)=0

We get rid of parentheses

-2.5d-87+91=0

We add all the numbers together, and all the variables

-2.5d+4=0

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

-2.5d=-4

d=-4/-2.5

d=1+1/1.6666666666667

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