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(m - 1)x - (m + 7m - 5)x + 5m - 9 = 0mx - x - mx - 7mx + 5x + 5m - 9 = 0
4x - 7mx + 5m = 9
mx -x - 8mx +5x + 5m + 9 = 0
-7mx + 4x +5m + 9 = 0
5m + 9 = 7mx - 4x
5m+9 = x ( 7m - 4)
x = 5m+9 / 7m-4