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y in (-oo:+oo)
(2/3)*y+7 = (-4/5)*y-(1/5) // - (-4/5)*y-(1/5)
(2/3)*y-((-4/5)*y)+1/5+7 = 0
(2/3)*y+(4/5)*y+1/5+7 = 0
22/15*y+36/5 = 0 // - 36/5
22/15*y = -36/5 // : 22/15
y = -36/5/22/15
y = -54/11
y = -54/11
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