As long as the equation is 9x3 + 27x2 - 90x = 0, the answer is :
27 + 27x2 - 90x = 0 9x3 = 27
27 + 54 - 90x = 0 27x2 = 54
81 - 90x = 0 27 + 54 = 81
81 = 90x add 90x to each side
9/10 = x divide each side by 90
x = .9
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