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y in (-oo:+oo)
(-1/2)*y-(4/5) = -2/7 // + -2/7
(-1/2)*y-(4/5)-(-2/7) = 0
(-1/2)*y-4/5+2/7 = 0
-1/2*y-18/35 = 0 // + 18/35
-1/2*y = 18/35 // : -1/2
y = 18/35/(-1/2)
y = -36/35
y = -36/35
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