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x in (-oo:+oo)
20*(5-((10*x)/30)) = 0
20*((-1/3)*x+5) = 0
20*(5-1/3*x) = 0
5-1/3*x = 0 // - 5
-1/3*x = -5 // : -1/3
x = -5/(-1/3)
x = 15
x = 15
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