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y in (-oo:+oo)
10 = (-2/9)*y // - (-2/9)*y
10-((-2/9)*y) = 0
(2/9)*y+10 = 0
2/9*y+10 = 0 // - 10
2/9*y = -10 // : 2/9
y = -10/2/9
y = -45
y = -45
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