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x in (-oo:+oo)
-35/15 = (6*x)/15 // - (6*x)/15
-((6*x)/15)-35/15 = 0
(-2/5)*x-35/15 = 0
-2/5*x-7/3 = 0 // + 7/3
-2/5*x = 7/3 // : -2/5
x = 7/3/(-2/5)
x = -35/6
x = -35/6
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