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7+10f=-7+5f+7f
We move all terms to the left:
7+10f-(-7+5f+7f)=0
We add all the numbers together, and all the variables
10f-(12f-7)+7=0
We get rid of parentheses
10f-12f+7+7=0
We add all the numbers together, and all the variables
-2f+14=0
We move all terms containing f to the left, all other terms to the right
-2f=-14
f=-14/-2
f=+7
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