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41x-x²-120+1-1=5x-5-x²-9-2
41x-x²+x²-5x=120-9-2-5
36x=104
x=9;26
40x-120-x²+1=5x-5-(x²+6x+9)-2
40x-x²-120+1=5x-5-x²-6x-9-2
40x-x²+x²-5x+6x=120-1-9-2-5
41x=103
x=103/41