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x in (-oo:+oo)
x+x-(4/8)+9/3 = 9/8 // - 9/8
x+x-(4/8)+9/3-(9/8) = 0
x+x-1/2+9/3-9/8 = 0
2*x+11/8 = 0 // - 11/8
2*x = -11/8 // : 2
x = -11/8/2
x = -11/16
x = -11/16
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