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x in (-oo:+oo)
2.6 = x/0.2-0.4 // - x/0.2-0.4
0.4-(x/0.2)+2.6 = 0
0.4-5*x+2.6 = 0
3-5*x = 0 // - 3
-5*x = -3 // : -5
x = -3/(-5)
x = 3/5
x = 3/5
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