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98.5=70+f
We move all terms to the left:
98.5-(70+f)=0
We add all the numbers together, and all the variables
-(f+70)+98.5=0
We get rid of parentheses
-f-70+98.5=0
We add all the numbers together, and all the variables
-1f+28.5=0
We move all terms containing f to the left, all other terms to the right
-f=-28.5
f=-28.5/-1
f=28+0.5/1
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