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Efectuati calculele
a) (32x⁷-48x⁶) : (-16x⁵) + x(x - 3)
b) (18x⁵-27x⁴) : (-9x³) + 2x(x+5)
c) (35x¹⁰-49x⁹+63x⁸) : (-7x⁸)+(-25x¹²) : (-5x¹⁰)
d) (24x⁸-36x⁷-12x⁶) : (-6x⁵) + (-48x¹⁰) : (-12x⁷) ​.