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a in (-oo:+oo)
a/3.5 = 14/7 // - 14/7
a/3.5-(14/7) = 0
a/3.5-2 = 0
0.28571429*a-2 = 0 // + 2
0.28571429*a = 2 // : 0.28571429
a = 2/0.28571429
a = 6.9999999
a = 6.9999999
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