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x in (-oo:+oo)
6*x+9/4 = 2*x // - 2*x
6*x-(2*x)+9/4 = 0
6*x-2*x+9/4 = 0
4*x+9/4 = 0 // - 9/4
4*x = -9/4 // : 4
x = -9/4/4
x = -9/16
x = -9/16
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