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x in (-oo:+oo)
x+x+10 = 4/5 // - 4/5
x+x-(4/5)+10 = 0
x+x-4/5+10 = 0
2*x+46/5 = 0 // - 46/5
2*x = -46/5 // : 2
x = -46/5/2
x = -23/5
x = -23/5
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