-d+100=-3d+200

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Solution for -d+100=-3d+200 equation: 



-d+100=-3d+200

We move all terms to the left:

-d+100-(-3d+200)=0

We add all the numbers together, and all the variables

-1d-(-3d+200)+100=0

We get rid of parentheses

-1d+3d-200+100=0

We add all the numbers together, and all the variables

2d-100=0

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

2d=100

d=100/2

d=50

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