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f(-3)=-2(-3)-5(-3)+4
We move all terms to the left:
f(-3)-(-2(-3)-5(-3)+4)=0
We add all the numbers together, and all the variables
f(-3)-25=0
We multiply parentheses
-3f-25=0
We move all terms containing f to the left, all other terms to the right
-3f=25
f=25/-3
f=-8+1/3
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