[tex]\displaystyle\bf\\3-x^{2} =x-(x+1)(x-6)\\\\3-x^{2} =x-(x^{2} -6x+x-6)\\\\3-x^{2} =x-x^{2} +5x+6\\\\-x^{2} -6x+x^{2} =6-3\\\\-6x=3\\\\\boxed{x=-0,5}[/tex]
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[tex]\displaystyle\bf\\3-x^{2} =x-(x+1)(x-6)\\\\3-x^{2} =x-(x^{2} -6x+x-6)\\\\3-x^{2} =x-x^{2} +5x+6\\\\-x^{2} -6x+x^{2} =6-3\\\\-6x=3\\\\\boxed{x=-0,5}[/tex]