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x in (-oo:+oo)
x/2+(3*x)/4 = -9 // + 9
x/2+(3*x)/4+9 = 0
5/4*x+9 = 0 // - 9
5/4*x = -9 // : 5/4
x = -9/5/4
x = -36/5
x = -36/5
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