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f(-2)=3(-2)+5
We simplify the equation to the form, which is simple to understand
f(-2)=3(-2)+5
Reorder the terms in parentheses
+(-2f)=3*(-2)+5
Remove unnecessary parentheses
-2f=+3+*(-2+)+5
Reorder the terms in parentheses
-2f=+(-6)+5
Remove unnecessary parentheses
-2f=-6+5
We move all terms containing f to the left and all other terms to the right.
-2f=-6+5
We simplify left and right side of the equation.
-2f=-1
We divide both sides of the equation by -2 to get f.
f=0.5
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