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98=7f+7
We move all terms to the left:
98-(7f+7)=0
We get rid of parentheses
-7f-7+98=0
We add all the numbers together, and all the variables
-7f+91=0
We move all terms containing f to the left, all other terms to the right
-7f=-91
f=-91/-7
f=+13
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