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x in (-oo:+oo)
20-((1/3)*x) = 19 // - 19
20-((1/3)*x)-19 = 0
(-1/3)*x-19+20 = 0
1-1/3*x = 0 // - 1
-1/3*x = -1 // : -1/3
x = -1/(-1/3)
x = 3
x = 3
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