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y in (-oo:+oo)
(-1/2)*y+3/7 = 5/7 // - 5/7
(-1/2)*y+3/7-(5/7) = 0
(-1/2)*y+3/7-5/7 = 0
-1/2*y-2/7 = 0 // + 2/7
-1/2*y = 2/7 // : -1/2
y = 2/7/(-1/2)
y = -4/7
y = -4/7
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