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x in (-oo:+oo)
(3*x)/(-0.5) = 1.9 // - 1.9
(3*x)/(-0.5)-1.9 = 0
-6*x-1.9 = 0 // + 1.9
-6*x = 1.9 // : -6
x = 1.9/(-6)
x = -0.31666667
x = -0.31666667
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