There are a few ways to isolate a variable. First, add or subtract anything to get a monomial on one side containing the variable. Then divide by anything that is being multiplied to the variable. Here is an example:
xy-4z=2z-4y solving for x
xy=(2z+4z)-4y
xy=6z-4y
x=(6z-4y)/y
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segregation or apartheid
divide by 51
n - 8 = 5 n = 13
As many solutions as there are points in the domain.
-- You select an operation. -- You apply the same operation to each side of the equation. -- You keep doing both steps until the equation says (the variable) = (the value of the variable)