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Explanation:
Set it up as a side ratio:
x+3 is to 8 as 3 is to x-2
(x+3) / 8 = 3/ (x-2) cross multiply
x^2 +x -6 = 24 re-arrange
x^2 + x - 30 = 0
(x-5)(x+6) = 0 shows x = 5 or -6 (throw out....does not work)