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x in (-oo:+oo)
x/(-4.75) = -20 // + 20
x/(-4.75)+20 = 0
20-0.21052632*x = 0 // - 20
-0.21052632*x = -20 // : -0.21052632
x = -20/(-0.21052632)
x = 94.9999981
x = 94.9999981
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