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x in (-oo:+oo)
F = (9/5)*x-40 // - (9/5)*x-40
F-((9/5)*x)+40 = 0
F+(-9/5)*x+40 = 0
F-9/5*x+40 = 0 // - F+40
-9/5*x = -(F+40) // : -9/5
x = (-(F+40))/(-9/5)
x = 5/9*(F+40)
x = 5/9*(F+40)
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