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43=10f+3
We move all terms to the left:
43-(10f+3)=0
We get rid of parentheses
-10f-3+43=0
We add all the numbers together, and all the variables
-10f+40=0
We move all terms containing f to the left, all other terms to the right
-10f=-40
f=-40/-10
f=+4
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