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x in (-oo:+oo)
39*x-(2*x)-(26/7)-7 = o // - o
39*x-o-(2*x)-(26/7)-7 = 0
39*x-o-2*x-26/7-7 = 0
37*x-o-75/7 = 0 // + -o-75/7
37*x = -(-o-75/7) // : 37
x = (-(-o-75/7))/37
x = (o+75/7)/37
x = (o+75/7)/37
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