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x in (-oo:+oo)
x/6.4 = 13 // - 13
x/6.4-13 = 0
0.15625*x-13 = 0 // + 13
0.15625*x = 13 // : 0.15625
x = 13/0.15625
x = 83.2
x = 83.2
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