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