9x = 30
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x - x2 - 9x + 14 = 0 ; whence, x2 + 8x = 14 , x2 + 8x + 16 = 30 , and x + 4 = ±√30 . Therefore, x = ±√30 - 4 .
2y - 9x = 14 2y = 14 + 9x y = (14 + 9x) / 2
9x-6xy = 3
-58.75 * 9x = -528.75x
7x - 9x = -2x