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x_15 in (-oo:+oo)
(9*x_15)/4+3 = 0
9/4*x_15+3 = 0 // - 3
9/4*x_15 = -3 // : 9/4
x_15 = -3/9/4
x_15 = -4/3
x_15 = -4/3
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