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