40=12+d

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Solution for 40=12+d equation: 



40=12+d

We move all terms to the left:

40-(12+d)=0

We add all the numbers together, and all the variables

-(d+12)+40=0

We get rid of parentheses

-d-12+40=0

We add all the numbers together, and all the variables

-1d+28=0

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

-d=-28

d=-28/-1

d=+28

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