9х² - 4 - 16х² + 6х + 40 х - 15 - 4х + 19 =0
-7х² + 42х = 0
7х(-х + 6) = 0
7х=0 -х=-6
х=0 х=6
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9х² - 4 - 16х² + 6х + 40 х - 15 - 4х + 19 =0
-7х² + 42х = 0
7х(-х + 6) = 0
7х=0 -х=-6
х=0 х=6