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It could be x(1 -1) when factorised
x(x - 7)
( x - 14 ) ( x + 14 )
x(x+5)
7x-x2 = x(7-x)
-47
x + x = x(1+1)
It is: x(x-3) factorized
(x - 6)(x + 1)
x(x-7)
X(X2 - X)
x2+7x x(x+7)
x2 + 4x = x(x + 4)