Find the value of x, if
⇒ (x+1)(x+2) – (x–1)(x–3) = 4 × 3 – 1 × (–1)
⇒ (x2 + 2x + x + 2) – (x2 – 3x – x + 3) = 12 + 1
⇒ –2x –1= 13
⇒ –2x = 14
⇒ x = –7
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