=((а^2+4a+4-a^2+2a)/(a-2)(a+2))* (a-2)/3а+2=(2(3а+2))/(а+2) * 1/(3а+2)=2/(а+2)
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=((а^2+4a+4-a^2+2a)/(a-2)(a+2))* (a-2)/3а+2=(2(3а+2))/(а+2) * 1/(3а+2)=2/(а+2)