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y in (-oo:+oo)
(-1/2)*y-(3/5) = -5/7 // + -5/7
(-1/2)*y-(3/5)-(-5/7) = 0
(-1/2)*y-3/5+5/7 = 0
4/35-1/2*y = 0 // - 4/35
-1/2*y = -4/35 // : -1/2
y = -4/35/(-1/2)
y = 8/35
y = 8/35
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