(x-1).(2x+3)-2x.(x-1)=0 (x+2).(x+3)-(x-2).(x+5)=0 (x-5).(-x+4)-(x-1).(x+3)=$-2x^{2}$

(x-1).(2x+3)-2x.(x-1)=0 (x+2).(x+3)-(x-2).(x+5)=0 (x-5).(-x+4)-(x-1).(x+3)=$-2x^{2}$
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