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15+3f=2+4f
We move all terms to the left:
15+3f-(2+4f)=0
We add all the numbers together, and all the variables
3f-(4f+2)+15=0
We get rid of parentheses
3f-4f-2+15=0
We add all the numbers together, and all the variables
-1f+13=0
We move all terms containing f to the left, all other terms to the right
-f=-13
f=-13/-1
f=+13
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