no, there aren't, only x as a variable
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let x be any integer
x is a variable. That means that it can be ANY NUMBER, It just depends on the problem. For example: x+5=8 x=8-5 x=3
find x 12 - x = 2 x x = ? 15 + x = 4 x answers: 4 3
Zero Matrix Zero of a Function Zero Slope
It refers to the y or x axis on a graph. The x-axis is located at any point with 0 as the y point. The y-axis is located at any point with 0 as the x point.