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(x+5)^2-(x-3)^2-x-91=0
x^2+10x+25-(x^2-6x+9)-x=91
x^2+10x-x^2+6x-x=91+9-25
15x=75
x=5
x²+10x+25-x²+6x-9-x-91=0
15x=75/:15
x=5