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f(40.3)=3(40.3)+7
We move all terms to the left:
f(40.3)-(3(40.3)+7)=0
We add all the numbers together, and all the variables
f(40.3)-127.9=0
We multiply parentheses
40.3f-127.9=0
We move all terms containing f to the left, all other terms to the right
40.3f=127.9
f=127.9/40.3
f=3+7/40.3
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