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121.1=19.3+4d
We move all terms to the left:
121.1-(19.3+4d)=0
We add all the numbers together, and all the variables
-(4d+19.3)+121.1=0
We get rid of parentheses
-4d-19.3+121.1=0
We add all the numbers together, and all the variables
-4d+101.8=0
We move all terms containing d to the left, all other terms to the right
-4d=-101.8
d=-101.8/-4
d=25+1/2.22222222222
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