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x in (-oo:+oo)
2/15 = (3/5)*x // - (3/5)*x
2/15-((3/5)*x) = 0
(-3/5)*x+2/15 = 0
2/15-3/5*x = 0 // - 2/15
-3/5*x = -2/15 // : -3/5
x = -2/15/(-3/5)
x = 2/9
x = 2/9
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