4х² = 0 или х+9 = 0
х = 0 или х = -9
....-..........+..................+
-----[-9]--------[0]--------->
х€(-беск.;-9] и {0}
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4х² = 0 или х+9 = 0
х = 0 или х = -9
....-..........+..................+
-----[-9]--------[0]--------->
х€(-беск.;-9] и {0}