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