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y in (-oo:+oo)
(-1/3)*y-(1/2) = -8/7 // + -8/7
(-1/3)*y-(1/2)-(-8/7) = 0
(-1/3)*y-1/2+8/7 = 0
9/14-1/3*y = 0 // - 9/14
-1/3*y = -9/14 // : -1/3
y = -9/14/(-1/3)
y = 27/14
y = 27/14
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