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2x3 - 7 + 5x - x3 + 3x - x3 = 8x - 7
x3 + 8 = x3 + 23 = (x + 2)[x2 - (x)(2) + 22] = (x + 2) (x2 - 2x + 4)
31
y2=x3+3x2
1.6667