It is known that the M-1 power + 1 = 0 of X is a linear equation of one variable about X, and the equation MX = 2m-7x is solved I'm four ninths~

m-1=1
∴m=2
Substituting M = 2 into MX = 2m-7x leads to
2x=4-7x
9x=4
∴x=4/9

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