Выполнить сложение и вычитание: а) (2а-5b)+(-3a+2b)
б) [tex]( 5^{3} - 3x^{2}-7) + (4+3 x^{2} - 5^{3} )[/tex]
в) [tex]( x^{2} - 3x)- (2x+1)[/tex]
г)[tex](- 2x^{2} - 3x+4)-(- 2x+ 7x-6)[/tex]
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