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