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x in (-oo:+oo)
x/3-((2*x)/5)-(8/15) = 0
x/3+(-2/5)*x-8/15 = 0
-1/15*x-8/15 = 0 // + 8/15
-1/15*x = 8/15 // : -1/15
x = 8/15/(-1/15)
x = -8
x = -8
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