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1.2(d+5)=42
We move all terms to the left:
1.2(d+5)-(42)=0
We multiply parentheses
1.2d+6-42=0
We add all the numbers together, and all the variables
1.2d-36=0
We move all terms containing d to the left, all other terms to the right
1.2d=36
d=36/1.2
d=30
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