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y in (-oo:+oo)
12 = (-2/7)*y // - (-2/7)*y
12-((-2/7)*y) = 0
(2/7)*y+12 = 0
2/7*y+12 = 0 // - 12
2/7*y = -12 // : 2/7
y = -12/2/7
y = -42
y = -42
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