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f(-3)=5.2(-3)-4
We move all terms to the left:
f(-3)-(5.2(-3)-4)=0
We add all the numbers together, and all the variables
f(-3)+19.6=0
We multiply parentheses
-3f+19.6=0
We move all terms containing f to the left, all other terms to the right
-3f=-19.6
f=-19.6/-3
f=6+1/1.875
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