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131=28f+15
We move all terms to the left:
131-(28f+15)=0
We get rid of parentheses
-28f-15+131=0
We add all the numbers together, and all the variables
-28f+116=0
We move all terms containing f to the left, all other terms to the right
-28f=-116
f=-116/-28
f=4+1/7
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