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x in (-oo:+oo)
(3.2*x)/320.4 = 72 // - 72
(3.2*x)/320.4-72 = 0
0.00998752*x-72 = 0 // + 72
0.00998752*x = 72 // : 0.00998752
x = 72/0.00998752
x = 7208.99682804
x = 7208.99682804
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