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x in (-oo:+oo)
x/10+x/3 = 39 // - 39
x/10+x/3-39 = 0
(1/10+1/3)*x-39 = 0 // + 39
(1/10+1/3)*x = 39 // : 1/10+1/3
x = 39/(1/10+1/3)
x = 39/(1/10+1/3)
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