(7-9x)/(2-3x) -(4x-5)/(2-3x) =1
[(7-9x) -(4x-5)]/(2-3x) =1
(7-9x -4x+5)/(2-3x) =1
(12-13x)/(2-3x) =1
(12-13x)/(2-3x) -1=0
[(12-13x)-(2-3x) ]/(2-3x) =0
(12-13x-2+3x)/(2-3x) =0
(10-10x)/(2-3x) =0
10(1-x)/(2-3x) =0
(1-x)/(2-3x) =0
1-x=0
x=1
经检验x=1是方程的解
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