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y in (-oo:+oo)
2/3-((1/2)*y) = -2/5 // + -2/5
2/3-((1/2)*y)-(-2/5) = 0
(-1/2)*y+2/3+2/5 = 0
16/15-1/2*y = 0 // - 16/15
-1/2*y = -16/15 // : -1/2
y = -16/15/(-1/2)
y = 32/15
y = 32/15
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