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x in (-oo:+oo)
-6*x = 18/5 // - 18/5
-6*x-(18/5) = 0
-6*x-18/5 = 0
-6*x-18/5 = 0 // + 18/5
-6*x = 18/5 // : -6
x = 18/5/(-6)
x = -3/5
x = -3/5
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