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x in (-oo:+oo)
x/5.1 = 2.55 // - 2.55
x/5.1-2.55 = 0
0.19607843*x-2.55 = 0 // + 2.55
0.19607843*x = 2.55 // : 0.19607843
x = 2.55/0.19607843
x = 13.00500009
x = 13.00500009
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