Solve for f_1
f_{1}=72
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46=40+150-2f_{1}
Multiply 30 and 5 to get 150.
46=190-2f_{1}
Add 40 and 150 to get 190.
190-2f_{1}=46
Swap sides so that all variable terms are on the left hand side.
-2f_{1}=46-190
Subtract 190 from both sides.
-2f_{1}=-144
Subtract 190 from 46 to get -144.
f_{1}=\frac{-144}{-2}
Divide both sides by -2.
f_{1}=72
Divide -144 by -2 to get 72.
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