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x in (-oo:+oo)
(5*x)/2+9 = 2*x-4 // - 2*x-4
(5*x)/2-(2*x)+4+9 = 0
(5*x)/2-2*x+4+9 = 0
1/2*x+13 = 0 // - 13
1/2*x = -13 // : 1/2
x = -13/1/2
x = -26
x = -26
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