Пусть число х
x² - 2x·(x+5) =25
x²-2x²-10x -25=0
x²+10x+25=0
x=-5
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Пусть число х
x² - 2x·(x+5) =25
x²-2x²-10x -25=0
x²+10x+25=0
x=-5