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y in (-oo:+oo)
(-1/2)*y+1/5 = -1/7 // + -1/7
(-1/2)*y+1/5-(-1/7) = 0
(-1/2)*y+1/5+1/7 = 0
12/35-1/2*y = 0 // - 12/35
-1/2*y = -12/35 // : -1/2
y = -12/35/(-1/2)
y = 24/35
y = 24/35
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