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d-21/12=31/12
We move all terms to the left:
d-21/12-(31/12)=0
We add all the numbers together, and all the variables
d-21/12-(+31/12)=0
We get rid of parentheses
d-21/12-31/12=0
We multiply all the terms by the denominator
d*12-21-31=0
We add all the numbers together, and all the variables
d*12-52=0
Wy multiply elements
12d-52=0
We move all terms containing d to the left, all other terms to the right
12d=52
d=52/12
d=4+1/3
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