Solve for f
f=-3.3
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-2f=5.7+0.9
Add 0.9 to both sides.
-2f=6.6
Add 5.7 and 0.9 to get 6.6.
f=\frac{6.6}{-2}
Divide both sides by -2.
f=\frac{66}{-20}
Expand \frac{6.6}{-2} by multiplying both numerator and the denominator by 10.
f=-\frac{33}{10}
Reduce the fraction \frac{66}{-20} to lowest terms by extracting and canceling out 2.
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