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f(13)=-3(13)+2
We simplify the equation to the form, which is simple to understand
f(13)=-3(13)+2
Reorder the terms in parentheses
+(+13f)=-3*(13)+2
Remove unnecessary parentheses
+13f=-3+*(+13+)+2
Reorder the terms in parentheses
+13f=+(-39)+2
Remove unnecessary parentheses
+13f=-39+2
We move all terms containing f to the left and all other terms to the right.
+13f=-39+2
We simplify left and right side of the equation.
+13f=-37
We divide both sides of the equation by 13 to get f.
f=-2.84615384615
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