Объяснение:
+9=3x |*4
x²+36=12x
x²+36-12x=0
x²-12x+36=0
(x-6)²=0
x-6=0
x=6
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Объяснение:
+9=3x |*4
x²+36=12x
x²+36-12x=0
x²-12x+36=0
(x-6)²=0
x-6=0
x=6