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24 = (3/8)*x-15 // - (3/8)*x-15
15-((3/8)*x)+24 = 0
(-3/8)*x+15+24 = 0
39-3/8*x = 0 // - 39
-3/8*x = -39 // : -3/8
x = -39/(-3/8)
x = 104
x = 104
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