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x in (-oo:+oo)
(1/2)*x+2/3 = -3 // + 3
(1/2)*x+2/3+3 = 0
1/2*x+11/3 = 0 // - 11/3
1/2*x = -11/3 // : 1/2
x = -11/3/1/2
x = -22/3
x = -22/3
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