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x in (-oo:+oo)
x/2.6 = 3.5 // - 3.5
x/2.6-3.5 = 0
0.38461538*x-3.5 = 0 // + 3.5
0.38461538*x = 3.5 // : 0.38461538
x = 3.5/0.38461538
x = 9.10000011
x = 9.10000011
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