X (3m-1) · 2n + 1 + 9 = 0 is a one variable linear equation about X, then M and n should satisfy the condition m, n=

X (3m-1) · 2n + 1 + 9 = 0 is a one variable linear equation about X, then M and n should satisfy the condition m, n=

(3m-1) · 2 n is not equal to 0
M is not equal to 1 / 3, n is not equal to 0
Otherwise, there will be no unknowns, not one variable linear equation