To find sales tax on something, multiply the percent of the tax by the price of the item.
I think it would be:
22 + x = 118 for your equation.
And then to solve, it would be:
22 + x = 118
-22 -22
x = 96
Average length of black mamba = 96 inches
However it is late where I am so my bad if that’s not what you needed