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x in (-oo:+oo)
8-(x/0.3) = 5.4 // - 5.4
8-(x/0.3)-5.4 = 0
8-3.33333333*x-5.4 = 0
2.6-3.33333333*x = 0 // - 2.6
-3.33333333*x = -2.6 // : -3.33333333
x = -2.6/(-3.33333333)
x = 0.78
x = 0.78
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