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y in (-oo:+oo)
3/28 = -y/7 // + -y/7
3/28-(-y/7) = 0
(1/7)*y+3/28 = 0
1/7*y+3/28 = 0 // - 3/28
1/7*y = -3/28 // : 1/7
y = -3/28/1/7
y = -3/4
y = -3/4
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