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3=d/12
We move all terms to the left:
3-(d/12)=0
We add all the numbers together, and all the variables
-(+d/12)+3=0
We get rid of parentheses
-d/12+3=0
We multiply all the terms by the denominator
-d+3*12=0
We add all the numbers together, and all the variables
-1d+36=0
We move all terms containing d to the left, all other terms to the right
-d=-36
d=-36/-1
d=+36
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