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-7=-d/3-3
We move all terms to the left:
-7-(-d/3-3)=0
We get rid of parentheses
d/3+3-7=0
We multiply all the terms by the denominator
d+3*3-7*3=0
We add all the numbers together, and all the variables
d-12=0
We move all terms containing d to the left, all other terms to the right
d=12
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