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x in (-oo:+oo)
80 = (65*x)/2 // - (65*x)/2
80-((65*x)/2) = 0
(-65/2)*x+80 = 0
80-65/2*x = 0 // - 80
-65/2*x = -80 // : -65/2
x = -80/(-65/2)
x = 32/13
x = 32/13
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