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x in (-oo:+oo)
(6*x)/5-(x/3) = -39 // + 39
(6*x)/5-(x/3)+39 = 0
13/15*x+39 = 0 // - 39
13/15*x = -39 // : 13/15
x = -39/13/15
x = -45
x = -45
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