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y in (-oo:+oo)
6 = -y/5 // + -y/5
6-(-y/5) = 0
(1/5)*y+6 = 0
1/5*y+6 = 0 // - 6
1/5*y = -6 // : 1/5
y = -6/1/5
y = -30
y = -30
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