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1.20(d+50)=42
We move all terms to the left:
1.20(d+50)-(42)=0
We multiply parentheses
1.2d+60-42=0
We add all the numbers together, and all the variables
1.2d+18=0
We move all terms containing d to the left, all other terms to the right
1.2d=-18
d=-18/1.2
d=-15
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