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y in (-oo:+oo)
15 = -y/3 // + -y/3
15-(-y/3) = 0
(1/3)*y+15 = 0
1/3*y+15 = 0 // - 15
1/3*y = -15 // : 1/3
y = -15/1/3
y = -45
y = -45
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