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x² + 10x + 21 = 0
x 7 ----->>> (x + 7)
x 3 ----->>> (x + 3)
⇒ (x + 7)(x + 3) = 0
Entonces:
x + 7 = 0
x = -7 ----> Solución 1
x + 3 = 0
x = -3 ----> Solución 2
RTA:
⇒ x = {-3 , -7}