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f(-2)=-8/5(-2)-4
We simplify the equation to the form, which is simple to understand
f(-2)=-8/5(-2)-4
Reorder the terms in parentheses
+(-2f)=-1.6*(-2)-4
Remove unnecessary parentheses
-2f=-1.6+*(-2+)-4
Reorder the terms in parentheses
-2f=+(+3.2)-4
Remove unnecessary parentheses
-2f=+3.2-4
We move all terms containing f to the left and all other terms to the right.
-2f=+3.2-4
We simplify left and right side of the equation.
-2f=-0.8
We divide both sides of the equation by -2 to get f.
f=0.4
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