Solve =1*6*10^-19*1*5=2*40*10^-19J=

$$= 1 \cdot 6 \times 10 ^ { - 19 } \times 1 \cdot 5 = 2 \cdot 40 \times 10 ^ { - 19 } J =$$

Solve for J

$$J=\frac{3}{8}=0.375$$

Steps for Solving Linear Equation

Multiply 1 and 6 to get 6.

$$6\times 10^{-19}\times 1\times 5=2\times 40\times 10^{-19}J$$

Calculate 10 to the power of -19 and get \frac{1}{10000000000000000000}.

$$6\times \frac{1}{10000000000000000000}\times 1\times 5=2\times 40\times 10^{-19}J$$

Multiply 6 and \frac{1}{10000000000000000000} to get \frac{3}{5000000000000000000}.

$$\frac{3}{5000000000000000000}\times 1\times 5=2\times 40\times 10^{-19}J$$

Multiply \frac{3}{5000000000000000000} and 1 to get \frac{3}{5000000000000000000}.

$$\frac{3}{5000000000000000000}\times 5=2\times 40\times 10^{-19}J$$

Multiply \frac{3}{5000000000000000000} and 5 to get \frac{3}{1000000000000000000}.

$$\frac{3}{1000000000000000000}=2\times 40\times 10^{-19}J$$

Multiply 2 and 40 to get 80.

$$\frac{3}{1000000000000000000}=80\times 10^{-19}J$$

Calculate 10 to the power of -19 and get \frac{1}{10000000000000000000}.

$$\frac{3}{1000000000000000000}=80\times \frac{1}{10000000000000000000}J$$

Multiply 80 and \frac{1}{10000000000000000000} to get \frac{1}{125000000000000000}.

$$\frac{3}{1000000000000000000}=\frac{1}{125000000000000000}J$$

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

$$\frac{1}{125000000000000000}J=\frac{3}{1000000000000000000}$$

Multiply both sides by 125000000000000000, the reciprocal of \frac{1}{125000000000000000}.

$$J=\frac{3}{1000000000000000000}\times 125000000000000000$$

Multiply \frac{3}{1000000000000000000} and 125000000000000000 to get \frac{3}{8}.

$$J=\frac{3}{8}$$