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x in (-oo:+oo)
(2/3)*x-(1/2) = -1 // + 1
(2/3)*x-(1/2)+1 = 0
(2/3)*x-1/2+1 = 0
2/3*x+1/2 = 0 // - 1/2
2/3*x = -1/2 // : 2/3
x = -1/2/2/3
x = -3/4
x = -3/4
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