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y in (-oo:+oo)
27 = -y/7 // + -y/7
27-(-y/7) = 0
(1/7)*y+27 = 0
1/7*y+27 = 0 // - 27
1/7*y = -27 // : 1/7
y = -27/1/7
y = -189
y = -189
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