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4(d-7)+3(5d-3)=1
We move all terms to the left:
4(d-7)+3(5d-3)-(1)=0
We multiply parentheses
4d+15d-28-9-1=0
We add all the numbers together, and all the variables
19d-38=0
We move all terms containing d to the left, all other terms to the right
19d=38
d=38/19
d=2
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