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25-4f=10-2.5f
We move all terms to the left:
25-4f-(10-2.5f)=0
We add all the numbers together, and all the variables
-4f-(-2.5f+10)+25=0
We get rid of parentheses
-4f+2.5f-10+25=0
We add all the numbers together, and all the variables
-1.5f+15=0
We move all terms containing f to the left, all other terms to the right
-1.5f=-15
f=-15/-1.5
f=+10
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