regroup and factorise a^2-a(p+3q+3pq
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2x +px + pa + 2a
2x +px + pa + 2ax(2+p) + a(2+p)
2x +px + pa + 2ax(2+p) + a(2+p)(x+a) (2+p)
2x +px + pa + 2ax(2+p) + a(2+p)(x+a) (2+p)x= -a. x= -p
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