18=20-f

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Solution for 18=20-f equation:


18=20-f

We simplify the equation to the form, which is simple to understand 
18=20-f

We move all terms containing f to the left and all other terms to the right. 
+1f=+20-18

We simplify left and right side of the equation. 
+1f=+2

We divide both sides of the equation by 01 to get f. 
f=2

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