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f(-2.5)=10-3(2.5)
We move all terms to the left:
f(-2.5)-(10-3(2.5))=0
We add all the numbers together, and all the variables
f(-2.5)-2.5=0
We multiply parentheses
-2.5f-2.5=0
We move all terms containing f to the left, all other terms to the right
-2.5f=2.5
f=2.5/-2.5
f=-1
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