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y in (-oo:+oo)
(7/5)*y-(7/3) = (-4/3)*y-1 // - (-4/3)*y-1
(7/5)*y-((-4/3)*y)-(7/3)+1 = 0
(7/5)*y+(4/3)*y-7/3+1 = 0
41/15*y-4/3 = 0 // + 4/3
41/15*y = 4/3 // : 41/15
y = 4/3/41/15
y = 20/41
y = 20/41
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