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x in (-oo:+oo)
x/0.4 = 1.75 // - 1.75
x/0.4-1.75 = 0
2.5*x-1.75 = 0 // + 1.75
2.5*x = 1.75 // : 2.5
x = 1.75/2.5
x = 0.7
x = 0.7
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