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x in (-oo:+oo)
x/3.5 = 8/14 // - 8/14
x/3.5-(8/14) = 0
x/3.5-4/7 = 0
0.28571429*x-4/7 = 0 // + 4/7
0.28571429*x = 4/7 // : 0.28571429
x = 4/7/0.28571429
x = 1.99999997
x = 1.99999997
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