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(5/4)*x-6 = (7/8)*x-(9/2) // - (7/8)*x-(9/2)
(5/4)*x-((7/8)*x)+9/2-6 = 0
(5/4)*x+(-7/8)*x+9/2-6 = 0
3/8*x-3/2 = 0 // + 3/2
3/8*x = 3/2 // : 3/8
x = 3/2/3/8
x = 4
x = 4
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