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x in (-oo:+oo)
x/2.8+4.9 = 7.11 // - 7.11
x/2.8-7.11+4.9 = 0
0.35714286*x-2.21 = 0 // + 2.21
0.35714286*x = 2.21 // : 0.35714286
x = 2.21/0.35714286
x = 6.18799995
x = 6.18799995
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