Solve 100=F+F1618+F2618

$$100 = F+F1618+F2618$$

Solve for F

$$F=100-F_{2618}-F_{1618}$$

Solution Steps

Swap sides so that all variable terms are on the left hand side.

$$F+F_{1618}+F_{2618}=100$$

Subtract F_{1618} from both sides.

$$F+F_{2618}=100-F_{1618}$$

Subtract F_{2618} from both sides.

$$F=100-F_{1618}-F_{2618}$$

Solve for F_1618

$$F_{1618}=100-F_{2618}-F$$

Solution Steps

Swap sides so that all variable terms are on the left hand side.

$$F+F_{1618}+F_{2618}=100$$

Subtract F from both sides.

$$F_{1618}+F_{2618}=100-F$$

Subtract F_{2618} from both sides.

$$F_{1618}=100-F-F_{2618}$$