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x in (-oo:+oo)
(3*(2*x-1))/7 = -9 // + 9
(3*(2*x-1))/7+9 = 0
(3*(2*x-1))/7+(7*9)/7 = 0
3*(2*x-1)+7*9 = 0
6*x+60 = 0
(6*x+60)/7 = 0
(6*x+60)/7 = 0 // * 7
6*x+60 = 0
6*x+60 = 0 // - 60
6*x = -60 // : 6
x = -60/6
x = -10
x = -10
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