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(x+1)² = (√(3x+7))²
x² + 2x +1 = 3x + 7
x² +2x +1 - 3x - 7 =0
x² -x - 6 =0
x -3
x 2
x-3 = 0 ∧ x+2=0
x=3 ∧ x=-2 respuesta B