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f(-2)=1+5(-2)
We simplify the equation to the form, which is simple to understand
f(-2)=1+5(-2)
Reorder the terms in parentheses
+(-2f)=1+5*(-2)
Remove unnecessary parentheses
-2f=+1+5+*(-2+)
Reorder the terms in parentheses
-2f=1+(-10)
Remove unnecessary parentheses
-2f=+1-10
We move all terms containing f to the left and all other terms to the right.
-2f=+1-10
We simplify left and right side of the equation.
-2f=-9
We divide both sides of the equation by -2 to get f.
f=4.5
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