SOLUTION: what if an equation had three variables what is the difference and similarieties between those equations that have one and/or two variable?

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The comparisons of equations with one and two variables have similarities because you have an unknown number, which you would need to use algebraic formulas by either multiplying, dividing, adding, or subtracting to get the unknown number. They are different in the ways in which they are treated to get the unknown number.
What if you had three variables:
Therefore, the general rule is:
To find one variable you need one equation
To find two variables you need two equations
To find three variables you need three equations
To find n variables you need n equations