90+40d=60+30d

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



90+40d=60+30d

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

40d-30d-60+90=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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