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y in (-oo:+oo)
(7/4)*y = -2/5 // + -2/5
(7/4)*y-(-2/5) = 0
(7/4)*y+2/5 = 0
7/4*y+2/5 = 0 // - 2/5
7/4*y = -2/5 // : 7/4
y = -2/5/7/4
y = -8/35
y = -8/35
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