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15+1f=6+3f
We move all terms to the left:
15+1f-(6+3f)=0
We add all the numbers together, and all the variables
1f-(3f+6)+15=0
We add all the numbers together, and all the variables
f-(3f+6)+15=0
We get rid of parentheses
f-3f-6+15=0
We add all the numbers together, and all the variables
-2f+9=0
We move all terms containing f to the left, all other terms to the right
-2f=-9
f=-9/-2
f=4+1/2
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