Solve for f
f=0.1355
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0.5=0.3645+f
Multiply 0.15 and 2.43 to get 0.3645.
0.3645+f=0.5
Swap sides so that all variable terms are on the left hand side.
f=0.5-0.3645
Subtract 0.3645 from both sides.
f=0.1355
Subtract 0.3645 from 0.5 to get 0.1355.
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