It is not an equation because it has no equality sign but it means xn squared-nx
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x is a variable. You do not have to know what its value is. In that equation you have to find the value of x, so if you already know what x stands for then you know the answer
what the solution to this equation x+15=28 If you mean: x+15 = 28 then the value of x works out as 13
The equation would be x=y/2 or y=2x
x=x
It means you should rearrange the equation so that x is on one side of the equal sign, and everything else on the other, with no "x" on the right side of the equation. For instance, if I was told to express x as a function of y and given the equation: x-4y=6 I would express x as a function of y by rearranging the equation to read: x = 6+4y