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a=-1.5:0.1:0;
x1=solve('x=6.94*10^17*exp((-x-0.84)/0.026)+0.98*(a+0.5)+0.02*(-40)','x');
x2=solve('x=6.94*10^17*exp((-x-0.84)/0.026)+0.98*(a+1.5)+0.02*(-39)','x');
y1=1.128*10^35*exp((-x1-0.84)/0.026)+0.331*10^15*exp((-x1-0.84)/0.013);
y2=1.128*10^35*exp((-x2-0.84)/0.026)+0.331*10^15*exp((-x2-0.84)/0.013);
z=0.00265*(y2-y1);
plot(a,z)
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Conversion to double from sym is not possible.

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plot(a,z)
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