1+d=9-d

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Solution for 1+d=9-d equation: 



1+d=9-d

We move all terms to the left:

1+d-(9-d)=0

We add all the numbers together, and all the variables

d-(-1d+9)+1=0

We get rid of parentheses

d+1d-9+1=0

We add all the numbers together, and all the variables

2d-8=0

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

2d=8

d=8/2

d=4

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