60+30d=90+40d

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Solution for 60+30d=90+40d equation: 



60+30d=90+40d

We move all terms to the left:

60+30d-(90+40d)=0

We add all the numbers together, and all the variables

30d-(40d+90)+60=0

We get rid of parentheses

30d-40d-90+60=0

We add all the numbers together, and all the variables

-10d-30=0

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

-10d=30

d=30/-10

d=-3

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