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x in (-oo:+oo)
x/35 = 12/14 // - 12/14
x/35-(12/14) = 0
x/35-6/7 = 0
1/35*x-6/7 = 0 // + 6/7
1/35*x = 6/7 // : 1/35
x = 6/7/1/35
x = 30
x = 30
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