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x in (-oo:+oo)
-x/6.8 = -0.4 // + 0.4
0.4-x/6.8 = 0
0.4-0.14705882*x = 0 // - 0.4
-0.14705882*x = -0.4 // : -0.14705882
x = -0.4/(-0.14705882)
x = 2.72000007
x = 2.72000007
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