f(-3)=2(-3)+2

Solution for f(-3)=2(-3)+2 equation:

f(-3)=2(-3)+2

We simplify the equation to the form, which is simple to understand 
f(-3)=2(-3)+2

Reorder the terms in parentheses
+(-3f)=2*(-3)+2

Remove unnecessary parentheses
-3f=+2+*(-3+)+2

Reorder the terms in parentheses
-3f=+(-6)+2

Remove unnecessary parentheses
-3f=-6+2

We move all terms containing f to the left and all other terms to the right. 
-3f=-6+2

We simplify left and right side of the equation. 
-3f=-4

We divide both sides of the equation by -3 to get f. 
f=1.33333333333