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x in (-oo:+oo)
x/0.4 = 1.5 // - 1.5
x/0.4-1.5 = 0
2.5*x-1.5 = 0 // + 1.5
2.5*x = 1.5 // : 2.5
x = 1.5/2.5
x = 0.6
x = 0.6
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