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x²+2x = 120
x²+2x-120 = 0 <= ecuación cuadrática
(x+12)(x-10) = 0 <= factorizando
x+12 = 0 | x-10= 0
x= -12 | x= 10
los valores de "x" son
x1= -12
x2 = 10
son los valores que cumplen :)