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x in (-oo:+oo)
20/5 = (4*x)/6 // - (4*x)/6
20/5-((4*x)/6) = 0
(-2/3)*x+20/5 = 0
4-2/3*x = 0 // - 4
-2/3*x = -4 // : -2/3
x = -4/(-2/3)
x = 6
x = 6
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