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f(-7)=-3(-7)+7
We simplify the equation to the form, which is simple to understand
f(-7)=-3(-7)+7
Reorder the terms in parentheses
+(-7f)=-3*(-7)+7
Remove unnecessary parentheses
-7f=-3+*(-7+)+7
Reorder the terms in parentheses
-7f=+(+21)+7
Remove unnecessary parentheses
-7f=+21+7
We move all terms containing f to the left and all other terms to the right.
-7f=+21+7
We simplify left and right side of the equation.
-7f=+28
We divide both sides of the equation by -7 to get f.
f=-4
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