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f(-3)=6(-3)-7
We move all terms to the left:
f(-3)-(6(-3)-7)=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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