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x in (-oo:+oo)
x/6+6 = (3*x)/10-(2/3) // - (3*x)/10-(2/3)
x/6-((3*x)/10)+2/3+6 = 0
x/6+(-3/10)*x+2/3+6 = 0
20/3-2/15*x = 0 // - 20/3
-2/15*x = -20/3 // : -2/15
x = -20/3/(-2/15)
x = 50
x = 50
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