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5f+45=f+6
We move all terms to the left:
5f+45-(f+6)=0
We get rid of parentheses
5f-f-6+45=0
We add all the numbers together, and all the variables
4f+39=0
We move all terms containing f to the left, all other terms to the right
4f=-39
f=-39/4
f=-9+3/4
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