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9-x+1 +2√(9-x) = x+4
2√(9-x) = 2x-6
√(9-x) = x-3
9-x = x² - 6x + 9
0 = x² - 5x
0 = x(x-5) ; x ≠ 0
x = 5
x³ - x² = 125 - 25
= 100