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0.12f+0.021(17.000-f)=400
We move all terms to the left:
0.12f+0.021(17.000-f)-(400)=0
We add all the numbers together, and all the variables
0.12f+0.021(-1f+17)-400=0
We multiply parentheses
0.12f-0.021f+0.357-400=0
We add all the numbers together, and all the variables
0.099f-399.643=0
We move all terms containing f to the left, all other terms to the right
0.099f=399.643
f=399.643/0.099
f=4036+0.078999999999951/0.099
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