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5d+9=51-5d
We move all terms to the left:
5d+9-(51-5d)=0
We add all the numbers together, and all the variables
5d-(-5d+51)+9=0
We get rid of parentheses
5d+5d-51+9=0
We add all the numbers together, and all the variables
10d-42=0
We move all terms containing d to the left, all other terms to the right
10d=42
d=42/10
d=4+1/5
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