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(3+X)(X+1) + (X+2)(3X+1) = 5(X+1)(3X+1)
resolviendo eso nos queda:
4X^2 + 10X + 5 = 15X^2 + 20X + 5
11X^2 + 10X = 0
entonces sacando factor comun nos queda:
X( 11X + 10) = 0
entonces como respuestas tenemos:
X1 = 0 y X2 = - 10/11
SALUDOS!