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x in (-oo:+oo)
6-(4*x) = 19/2 // - 19/2
6-(4*x)-(19/2) = 0
6-4*x-19/2 = 0
-4*x-7/2 = 0 // + 7/2
-4*x = 7/2 // : -4
x = 7/2/(-4)
x = -7/8
x = -7/8
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