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x in (-oo:+oo)
(1/2)*x+(2/3)*x+9 = 137/16 // - 137/16
(1/2)*x+(2/3)*x-(137/16)+9 = 0
(1/2)*x+(2/3)*x-137/16+9 = 0
7/6*x+7/16 = 0 // - 7/16
7/6*x = -7/16 // : 7/6
x = -7/16/7/6
x = -3/8
x = -3/8
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