30+2d=100

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Solution for 30+2d=100 equation: 



30+2d=100

We move all terms to the left:

30+2d-(100)=0

We add all the numbers together, and all the variables

2d-70=0

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

2d=70

d=70/2

d=35

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