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f(-2)=6.8(-2)+5
We move all terms to the left:
f(-2)-(6.8(-2)+5)=0
We add all the numbers together, and all the variables
f(-2)+8.6=0
We multiply parentheses
-2f+8.6=0
We move all terms containing f to the left, all other terms to the right
-2f=-8.6
f=-8.6/-2
f=4+0.6/2
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