Solve for f
f=40
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0.9f=49-13
Subtract 13 from both sides.
0.9f=36
Subtract 13 from 49 to get 36.
f=\frac{36}{0.9}
Divide both sides by 0.9.
f=\frac{360}{9}
Expand \frac{36}{0.9} by multiplying both numerator and the denominator by 10.
f=40
Divide 360 by 9 to get 40.
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