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y in (-oo:+oo)
(3/7)*y = -1/5 // + -1/5
(3/7)*y-(-1/5) = 0
(3/7)*y+1/5 = 0
3/7*y+1/5 = 0 // - 1/5
3/7*y = -1/5 // : 3/7
y = -1/5/3/7
y = -7/15
y = -7/15
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