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x in (-oo:+oo)
(2/3)*x-1 = -6 // + 6
(2/3)*x-1+6 = 0
2/3*x+5 = 0 // - 5
2/3*x = -5 // : 2/3
x = -5/2/3
x = -15/2
x = -15/2
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