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x in (-oo:+oo)
15/20-((12/20)*x) = 19 // - 19
15/20-((12/20)*x)-19 = 0
(-3/5)*x+15/20-19 = 0
-3/5*x-73/4 = 0 // + 73/4
-3/5*x = 73/4 // : -3/5
x = 73/4/(-3/5)
x = -365/12
x = -365/12
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