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2.8=2.8(f-7)
We move all terms to the left:
2.8-(2.8(f-7))=0
We calculate terms in parentheses: -(2.8(f-7)), so:We get rid of parentheses
2.8(f-7)
We multiply parentheses
2.8f-19.6
Back to the equation:
-(2.8f-19.6)
-2.8f+19.6+2.8=0
We add all the numbers together, and all the variables
-2.8f+22.4=0
We move all terms containing f to the left, all other terms to the right
-2.8f=-22.4
f=-22.4/-2.8
f=+8
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