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First I'd like to illustrate my solution to 6x^2 - 9 = 45, and then I'd like to get some help solving 5x^2 +8 = x^2 - 8. 6x^2 - 9 = 45 6x^2 = 54 x^2 = 9 sqrt(x^2) = sqrt(9) |x| = 3 x=-3, x=3 Now, 5...