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y in (-oo:+oo)
10 = (-2/7)*y // - (-2/7)*y
10-((-2/7)*y) = 0
(2/7)*y+10 = 0
2/7*y+10 = 0 // - 10
2/7*y = -10 // : 2/7
y = -10/2/7
y = -35
y = -35
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