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URGEEEENT!!!!
1)(5-x)(x+5)=4-x (x+3)
2)(2x+3)la patrat+5=(2x+3)(2x-3)-1
3)(x+2)la patrat+(x-7)la patrat=2x (x-3)+1
4)(4x-1)la patrat-3=(3x+2)la patrat+7x(x-2)