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x in (-oo:+oo)
(3/2)*(x+8) = 6 // - 6
(3/2)*(x+8)-6 = 0
3/2*(x+8)-6 = 0
3/2*(x+8)-6 = 0
3/2*x+6 = 0
3/2*x+6 = 0
3/2*x+6 = 0 // - 6
3/2*x = -6 // : 3/2
x = -6/3/2
x = -4
x = -4
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