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x in (-oo:+oo)
5/4-((5/8)*x) = 7/2 // - 7/2
5/4-((5/8)*x)-(7/2) = 0
(-5/8)*x+5/4-7/2 = 0
-5/8*x-9/4 = 0 // + 9/4
-5/8*x = 9/4 // : -5/8
x = 9/4/(-5/8)
x = -18/5
x = -18/5
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