18+3=d+12

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Solution for 18+3=d+12 equation: 



18+3=d+12

We move all terms to the left:

18+3-(d+12)=0

We add all the numbers together, and all the variables

-(d+12)+21=0

We get rid of parentheses

-d-12+21=0

We add all the numbers together, and all the variables

-1d+9=0

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

-d=-9

d=-9/-1

d=+9

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