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2.1+3d=d/0.2
We move all terms to the left:
2.1+3d-(d/0.2)=0
We add all the numbers together, and all the variables
3d-(+d/0.2)+2.1=0
We get rid of parentheses
3d-d/0.2+2.1=0
We multiply all the terms by the denominator
3d*0.2-d+(2.1)*0.2=0
We add all the numbers together, and all the variables
-1d+3d*0.2+0.42=0
Wy multiply elements
-1d+0.6d+0.42=0
We add all the numbers together, and all the variables
-0.4d+0.42=0
We move all terms containing d to the left, all other terms to the right
-0.4d=-0.42
d=-0.42/-0.4
d=1+0.02/0.4
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