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x in (-oo:+oo)
1-((3/8)*x) = 5/2 // - 5/2
1-((3/8)*x)-(5/2) = 0
(-3/8)*x-5/2+1 = 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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