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7^(x+1) + 7^x + 7^(x-1) = 399, what is x? Questions for medicine I could not get it and I need your help? If x^2+y^2 = 6, and x+y=3, then what is x^3+y^3? Find a positive angle, less than 360 degrees, that is coterminal with a 1715 degree angle. Please show steps!!? Discrete Help ASAP. Please write out symbolic notation.?