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3d+7.1=2.5d+11.5d
We move all terms to the left:
3d+7.1-(2.5d+11.5d)=0
We add all the numbers together, and all the variables
3d-(+14d)+7.1=0
We get rid of parentheses
3d-14d+7.1=0
We add all the numbers together, and all the variables
-11d+7.1=0
We move all terms containing d to the left, all other terms to the right
-11d=-7.1
d=-7.1/-11
d=6.4545454545455/10
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