solve,
=> x/3 = 1 + (x - 15)/5
=> x/3 = (5 + x - 15)/5
=> 5x = 3(x - 10)
=> 5x = 3x - 30
=> 2x = -30
=> x = -15
{ Check, -15/3 = 1 - 6 = -5, correct }
(A) The solution set is { -15 }
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