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y in (-oo:+oo)
1/2-((2/3)*y) = -3/7 // + -3/7
1/2-((2/3)*y)-(-3/7) = 0
(-2/3)*y+1/2+3/7 = 0
13/14-2/3*y = 0 // - 13/14
-2/3*y = -13/14 // : -2/3
y = -13/14/(-2/3)
y = 39/28
y = 39/28
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