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x in (-oo:+oo)
x/0.5 = 1.9 // - 1.9
x/0.5-1.9 = 0
2*x-1.9 = 0 // + 1.9
2*x = 1.9 // : 2
x = 1.9/2
x = 0.95
x = 0.95
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