(10х-3)^2=(10х+7)^2


P.s. ()^2 - Это степень

(10х-3)^2=(10х+7)^2100x^2 - 60x + 9 = 100x^2 + 140x + 49100x^2 - 60x + 9 - 100x^2 - 140x - 49 = 0-200x = -9 + 49-200x = 40x= -0,2

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