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21/2e+10=4e+1
We simplify the equation to the form, which is simple to understand
21/2e+10=4e+1
We move all terms containing e to the left and all other terms to the right.
+2e-4e=+1-10
We simplify left and right side of the equation.
-2e=-9
We divide both sides of the equation by -2 to get e.
e=4.5
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