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x in (-oo:+oo)
x/2.8 = 5.6 // - 5.6
x/2.8-5.6 = 0
0.35714286*x-5.6 = 0 // + 5.6
0.35714286*x = 5.6 // : 0.35714286
x = 5.6/0.35714286
x = 15.67999987
x = 15.67999987
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