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y in (-oo:+oo)
42 = (-7/5)*y // - (-7/5)*y
42-((-7/5)*y) = 0
(7/5)*y+42 = 0
7/5*y+42 = 0 // - 42
7/5*y = -42 // : 7/5
y = -42/7/5
y = -30
y = -30
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