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f(-2)=-2(-2)+3
We simplify the equation to the form, which is simple to understand
f(-2)=-2(-2)+3
Reorder the terms in parentheses
+(-2f)=-2*(-2)+3
Remove unnecessary parentheses
-2f=-2+*(-2+)+3
Reorder the terms in parentheses
-2f=+(+4)+3
Remove unnecessary parentheses
-2f=+4+3
We move all terms containing f to the left and all other terms to the right.
-2f=+4+3
We simplify left and right side of the equation.
-2f=+7
We divide both sides of the equation by -2 to get f.
f=-3.5
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