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13.13f+4=15.90
We simplify the equation to the form, which is simple to understand
13.13f+4=15.90
We move all terms containing f to the left and all other terms to the right.
+13.13f=+15.9-4
We simplify left and right side of the equation.
+13.13f=+11.9
We divide both sides of the equation by 13.13 to get f.
f=0.906321401371
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