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2.13=3.12-e
We simplify the equation to the form, which is simple to understand
2.13=3.12-e
We move all terms containing e to the left and all other terms to the right.
+1e=+3.12-2.13
We simplify left and right side of the equation.
+1e=0.99
We divide both sides of the equation by 01 to get e.
e=0.99
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