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x in (-oo:+oo)
x/0.5 = 0.3 // - 0.3
x/0.5-0.3 = 0
2*x-0.3 = 0 // + 0.3
2*x = 0.3 // : 2
x = 0.3/2
x = 0.15
x = 0.15
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