ПОМОГИТЕ ПОЖААЛУУЙСТА СРОЧНО
Упростить выражение:

[tex] \frac{2a - 3b}{a ^{2} b } -\frac{4a - 5b }{ab ^{2} } [/tex]=
[tex] \frac{5x ^{2} - 3y}{ x^{2} y} + \frac{6x - 2y ^{2} }{ x^{2} y ^{2} } [/tex]=
[tex] \frac{5(2a-b)}{8} - \frac{3(a-4b)}{2} + \frac{7(a-b)}{6} =[/tex]
Даю 10 б.
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