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10f=5-30
We move all terms to the left:
10f-(5-30)=0
We add all the numbers together, and all the variables
10f-(-25)=0
We add all the numbers together, and all the variables
10f+25=0
We move all terms containing f to the left, all other terms to the right
10f=-25
f=-25/10
f=-2+1/2
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