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x in (-oo:+oo)
x/2.7 = 4/5 // - 4/5
x/2.7-(4/5) = 0
x/2.7-4/5 = 0
0.37037037*x-4/5 = 0 // + 4/5
0.37037037*x = 4/5 // : 0.37037037
x = 4/5/0.37037037
x = 2.16
x = 2.16
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