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5x² + 36x + 7
5x .............. +1
x ............... +7
35x+x= 36x
(5x +1)(x+7)
x² + 3x - 28
x² + 3x + 7
x ............ +7
x .......... - 4
7x-4x = 3x
(x +7)(x-4)