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(70-(50*e^-x))'The calculation above is a derivative of the function f (x)
(-(50*e^-x))'+(70)'
(50)'*e^-x+50*(e^-x)'+(70)'
0*e^-x+50*(e^-x)'+(70)'
0*e^-x+50*ln(e)*e^-x+(70)'
0*e^-x+50*e^-x+(70)'
0-50*e^-x
-50*e^-x
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