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x in (-oo:+oo)
5*x-1 = x/2+8 // - x/2+8
5*x-(x/2)-8-1 = 0
9/2*x-9 = 0 // + 9
9/2*x = 9 // : 9/2
x = 9/9/2
x = 2
x = 2
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