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x in (-oo:+oo)
x = (720.1/5)*x+(2/5)*x // - (720.1/5)*x+(2/5)*x
x-((720.1/5)*x)-((2/5)*x) = 0
x-144.02*x+(-2/5)*x = 0
-143.42*x = 0 // : -143.42
x = 0
x = 0
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