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x in (-oo:+oo)
(6/4)*x = -15/4 // + -15/4
(6/4)*x-(-15/4) = 0
(6/4)*x+15/4 = 0
3/2*x+15/4 = 0 // - 15/4
3/2*x = -15/4 // : 3/2
x = -15/4/3/2
x = -5/2
x = -5/2
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