Solve for f
f=2
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0.5f-0.7=0.3
Swap sides so that all variable terms are on the left hand side.
0.5f=0.3+0.7
Add 0.7 to both sides.
0.5f=1
Add 0.3 and 0.7 to get 1.
f=\frac{1}{0.5}
Divide both sides by 0.5.
f=\frac{10}{5}
Expand \frac{1}{0.5} by multiplying both numerator and the denominator by 10.
f=2
Divide 10 by 5 to get 2.
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