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y in (-oo:+oo)
6 = 3-y/3 // - 3-y/3
6-(-y/3)-3 = 0
(1/3)*y-3+6 = 0
1/3*y+3 = 0 // - 3
1/3*y = -3 // : 1/3
y = -3/1/3
y = -9
y = -9
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