100-20d=150-10d

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Solution for 100-20d=150-10d equation: 



100-20d=150-10d

We move all terms to the left:

100-20d-(150-10d)=0

We add all the numbers together, and all the variables

-20d-(-10d+150)+100=0

We get rid of parentheses

-20d+10d-150+100=0

We add all the numbers together, and all the variables

-10d-50=0

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

-10d=50

d=50/-10

d=-5

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