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2e-12=7e+9
We simplify the equation to the form, which is simple to understand
2e-12=7e+9
We move all terms containing e to the left and all other terms to the right.
+2e-7e=+9+12
We simplify left and right side of the equation.
-5e=+21
We divide both sides of the equation by -5 to get e.
e=-4.2
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