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f(2.5)=1/2.5-2
We simplify the equation to the form, which is simple to understand
f(2.5)=1/2.5-2
Reorder the terms in parentheses
+(+2.5f)=0.4-2
Remove unnecessary parentheses
+2.5f=0.4-2
We move all terms containing f to the left and all other terms to the right.
+2.5f=0.4-2
We simplify left and right side of the equation.
+2.5f=-1.6
We divide both sides of the equation by 2.5 to get f.
f=-0.64
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