S=40-(0.8*d)

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Solution for S=40-(0.8*d) equation:



=40-(0.8S)
We move all terms to the left:
-(40-(0.8S))=0
We add all the numbers together, and all the variables
-(40-(+0.8S))=0
We calculate terms in parentheses: -(40-(+0.8S)), so:
40-(+0.8S)
determiningTheFunctionDomain -(+0.8S)+40
We get rid of parentheses
-0.8S+40
Back to the equation:
-(-0.8S+40)
We get rid of parentheses
0.8S-40=0
We move all terms containing S to the left, all other terms to the right
0.8S=40
S=40/0.8
S=50

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