Solve phi=45*30-20*25/65*55*50*70

$$\phi = \frac{ 45 \cdot 30-20 \cdot 25 }{ 65 \cdot 55 \cdot 50 \cdot 70 }$$

Solve for ϕ

$$ϕ=\frac{17}{250250}\approx 0.000067932$$

Steps for Solving Linear Equation

Multiply 45 and 30 to get 1350.

$$ϕ=\frac{1350-20\times 25}{65\times 55\times 50\times 70}$$

Multiply 20 and 25 to get 500.

$$ϕ=\frac{1350-500}{65\times 55\times 50\times 70}$$

Subtract 500 from 1350 to get 850.

$$ϕ=\frac{850}{65\times 55\times 50\times 70}$$

Multiply 65 and 55 to get 3575.

$$ϕ=\frac{850}{3575\times 50\times 70}$$

Multiply 3575 and 50 to get 178750.

$$ϕ=\frac{850}{178750\times 70}$$

Multiply 178750 and 70 to get 12512500.

$$ϕ=\frac{850}{12512500}$$

Reduce the fraction \frac{850}{12512500} to lowest terms by extracting and canceling out 50.

$$ϕ=\frac{17}{250250}$$

Assign ϕ

$$ϕ≔\frac{17}{250250}$$