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-f+5+10f=-7+7f
We move all terms to the left:
-f+5+10f-(-7+7f)=0
We add all the numbers together, and all the variables
-f+10f-(7f-7)+5=0
We add all the numbers together, and all the variables
9f-(7f-7)+5=0
We get rid of parentheses
9f-7f+7+5=0
We add all the numbers together, and all the variables
2f+12=0
We move all terms containing f to the left, all other terms to the right
2f=-12
f=-12/2
f=-6
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