Solve for F
F=6
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2.5F=15
Combine 0.7F and 1.8F to get 2.5F.
F=\frac{15}{2.5}
Divide both sides by 2.5.
F=\frac{150}{25}
Expand \frac{15}{2.5} by multiplying both numerator and the denominator by 10.
F=6
Divide 150 by 25 to get 6.
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