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60(10)d+70(8)(d+1)=2.900
We move all terms to the left:
60(10)d+70(8)(d+1)-(2.900)=0
We add all the numbers together, and all the variables
6010d+708(d+1)-(2.9)=0
We add all the numbers together, and all the variables
6010d+708(d+1)-2.9=0
We multiply parentheses
6010d+708d+708-2.9=0
We add all the numbers together, and all the variables
6718d+705.1=0
We move all terms containing d to the left, all other terms to the right
6718d=-705.1
d=-705.1/6718
d=-640.99999999999/6107.2727272726
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