Is it possible that the equation (2M2 + M-3) XM + 1 + 5x = 13 of X is one variable linear equation? Why (2M2 + M-3) XM-1 + 5x = 13? The 2 after "2M2" is an index. "M + 1" in "XM + 1" is a superscript and an index. "M-1" in "XM-1" is also a superscript and an index Sorry, it's a quadratic equation. Wrong number. Sorry

Is it possible that the equation (2M2 + M-3) XM + 1 + 5x = 13 of X is one variable linear equation? Why (2M2 + M-3) XM-1 + 5x = 13? The 2 after "2M2" is an index. "M + 1" in "XM + 1" is a superscript and an index. "M-1" in "XM-1" is also a superscript and an index Sorry, it's a quadratic equation. Wrong number. Sorry

If (2M2 + M-3) XM + 1 + 5x = 13 is a univariate quadratic equation M = 1,2m2 + M-3 ≠ 0, it can't hold (2M2 + M-3) XM + 1 + 5x = 13 at the same time, it can't be a univariate quadratic equation
If (2M2 + M-3) XM-1 + 5x = 13 is a univariate quadratic equation M = 3,2m2 + M-3 ≠ 0, it can hold (2M2 + M-3) XM + 1 + 5x = 13 at the same time, it may be a univariate quadratic equation