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y in (-oo:+oo)
2/3-((5/2)*y) = -2/7 // + -2/7
2/3-((5/2)*y)-(-2/7) = 0
(-5/2)*y+2/3+2/7 = 0
20/21-5/2*y = 0 // - 20/21
-5/2*y = -20/21 // : -5/2
y = -20/21/(-5/2)
y = 8/21
y = 8/21
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