55d+105=80d-120

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Solution for 55d+105=80d-120 equation: 



55d+105=80d-120

We move all terms to the left:

55d+105-(80d-120)=0

We get rid of parentheses

55d-80d+120+105=0

We add all the numbers together, and all the variables

-25d+225=0

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

-25d=-225

d=-225/-25

d=+9

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