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x in (-oo:+oo)
2/15 = (4/3)*x // - (4/3)*x
2/15-((4/3)*x) = 0
(-4/3)*x+2/15 = 0
2/15-4/3*x = 0 // - 2/15
-4/3*x = -2/15 // : -4/3
x = -2/15/(-4/3)
x = 1/10
x = 1/10
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