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x in (-oo:+oo)
x/80+x+40 = 0.6 // - 0.6
x/80+x-0.6+40 = 0
81/80*x+39.4 = 0 // - 39.4
81/80*x = -39.4 // : 81/80
x = -39.4/81/80
x = -38.91358025
x = -38.91358025
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