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10-3.5f=8-1.2f
We move all terms to the left:
10-3.5f-(8-1.2f)=0
We add all the numbers together, and all the variables
-3.5f-(-1.2f+8)+10=0
We get rid of parentheses
-3.5f+1.2f-8+10=0
We add all the numbers together, and all the variables
-2.3f+2=0
We move all terms containing f to the left, all other terms to the right
-2.3f=-2
f=-2/-2.3
f=1/1.15
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