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Reduceti termenii asemenea

5x-6-3x+7
15x-8-5x-1
3x^2-6x-7x2+2x
2x+5-8x-9
11+3x-9-9x
4x-9x^2-5x^2-7x
13-7x-2x-6
10+6x-4-8x
11x-x^2+17x^2-5x​