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