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x in (-oo:+oo)
6/15 = (10/3)*x+1 // - (10/3)*x+1
6/15-((10/3)*x)-1 = 0
(-10/3)*x+6/15-1 = 0
-10/3*x-3/5 = 0 // + 3/5
-10/3*x = 3/5 // : -10/3
x = 3/5/(-10/3)
x = -9/50
x = -9/50
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