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5f=56-3f
We move all terms to the left:
5f-(56-3f)=0
We add all the numbers together, and all the variables
5f-(-3f+56)=0
We get rid of parentheses
5f+3f-56=0
We add all the numbers together, and all the variables
8f-56=0
We move all terms containing f to the left, all other terms to the right
8f=56
f=56/8
f=7
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