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y in (-oo:+oo)
(-2/3)*y = -4/15 // + -4/15
(-2/3)*y-(-4/15) = 0
(-2/3)*y+4/15 = 0
4/15-2/3*y = 0 // - 4/15
-2/3*y = -4/15 // : -2/3
y = -4/15/(-2/3)
y = 2/5
y = 2/5
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