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7f-15=10f+3
We move all terms to the left:
7f-15-(10f+3)=0
We get rid of parentheses
7f-10f-3-15=0
We add all the numbers together, and all the variables
-3f-18=0
We move all terms containing f to the left, all other terms to the right
-3f=18
f=18/-3
f=-6
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