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x in (-oo:+oo)
80 = (20/3)*x // - (20/3)*x
80-((20/3)*x) = 0
(-20/3)*x+80 = 0
80-20/3*x = 0 // - 80
-20/3*x = -80 // : -20/3
x = -80/(-20/3)
x = 12
x = 12
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