Factorise :
x(a - 5) + y(5 - a).
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x(a - 5) + y(5 - a)
= x(a - 5) - y(a - 5)
= (a - 5)(x - y)
Hence, x(a - 5) + y(5 - a) = (a - 5)(x - y).
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If x - y + z = 5 and x2 + y2 + z2 = 49, find the value of : zx - xy - yz.