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x in (-oo:+oo)
7*x = 15/6 // - 15/6
7*x-(15/6) = 0
7*x-5/2 = 0
7*x-5/2 = 0 // + 5/2
7*x = 5/2 // : 7
x = 5/2/7
x = 5/14
x = 5/14
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