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y in (-oo:+oo)
49 = (-7/3)*y // - (-7/3)*y
49-((-7/3)*y) = 0
(7/3)*y+49 = 0
7/3*y+49 = 0 // - 49
7/3*y = -49 // : 7/3
y = -49/7/3
y = -21
y = -21
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