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(5/8)*x-9 = (1/4)*x-3 // - (1/4)*x-3
(5/8)*x-((1/4)*x)-9+3 = 0
(5/8)*x+(-1/4)*x-9+3 = 0
3/8*x-6 = 0 // + 6
3/8*x = 6 // : 3/8
x = 6/3/8
x = 16
x = 16
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