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y in (-oo:+oo)
12 = (-1/6)*y+6 // - (-1/6)*y+6
12-((-1/6)*y)-6 = 0
(1/6)*y-6+12 = 0
1/6*y+6 = 0 // - 6
1/6*y = -6 // : 1/6
y = -6/1/6
y = -36
y = -36
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