Solve for f_1
f_{1}=4
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72=60+\left(10-4-f_{1}\right)\times 6
Multiply both sides of the equation by 5.
72=60+\left(6-f_{1}\right)\times 6
Subtract 4 from 10 to get 6.
72=60+36-6f_{1}
Use the distributive property to multiply 6-f_{1} by 6.
72=96-6f_{1}
Add 60 and 36 to get 96.
96-6f_{1}=72
Swap sides so that all variable terms are on the left hand side.
-6f_{1}=72-96
Subtract 96 from both sides.
-6f_{1}=-24
Subtract 96 from 72 to get -24.
f_{1}=\frac{-24}{-6}
Divide both sides by -6.
f_{1}=4
Divide -24 by -6 to get 4.
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