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x in (-oo:+oo)
(1/2)*x = 13-(1/10) // - 13-(1/10)
(1/2)*x+1/10-13 = 0
1/2*x-129/10 = 0 // + 129/10
1/2*x = 129/10 // : 1/2
x = 129/10/1/2
x = 129/5
x = 129/5
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