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16x - 10x + 9*99 - 30 = 6x + 861
It is 75.
The vertex is (-9, -62).
16x - 10x + 9 = 99 - 30 6x + 9 = 69 so 6x = 60 or x = 10
[9x-5x+1] + [16x-2x-9] [4x+1] + [14x-9] [18x2+8]