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x in (-oo:+oo)
x+19 = (x+29)/2 // - (x+29)/2
x-((x+29)/2)+19 = 0
(-1*(x+29))/2+x+19 = 0
(-1*(x+29))/2+(2*x)/2+(2*19)/2 = 0
2*x-1*(x+29)+2*19 = 0
x-29+38 = 0
x+9 = 0
(x+9)/2 = 0
(x+9)/2 = 0 // * 2
x+9 = 0
x+9 = 0 // - 9
x = -9
x = -9
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