4. Reduceți termenii asemenea: a) 5x²-17x-23x² +15x-27; c) -7x² +35x-91x² +6x-53; e) 6x²-26x-45x² +57x-42; 5. Reduceți termenii asemenea: - b) 9x² -8x-19x² +35x-81; d) -47x²-39x-78x² +32x-62; f) -10x²-14x-18x² +48x-95.​