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x in (-oo:+oo)
x/0.1 = 0.65 // - 0.65
x/0.1-0.65 = 0
10*x-0.65 = 0 // + 0.65
10*x = 0.65 // : 10
x = 0.65/10
x = 0.065
x = 0.065
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