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10d+5(23-d)=145
We move all terms to the left:
10d+5(23-d)-(145)=0
We add all the numbers together, and all the variables
10d+5(-1d+23)-145=0
We multiply parentheses
10d-5d+115-145=0
We add all the numbers together, and all the variables
5d-30=0
We move all terms containing d to the left, all other terms to the right
5d=30
d=30/5
d=6
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