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x in (-oo:+oo)
(1/3)*x-((1/5)*x) = 6 // - 6
(1/3)*x-((1/5)*x)-6 = 0
(1/3)*x+(-1/5)*x-6 = 0
2/15*x-6 = 0 // + 6
2/15*x = 6 // : 2/15
x = 6/2/15
x = 45
x = 45
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