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y in (-oo:+oo)
(5/2)*y-(2/3) = (-5/4)*y-7 // - (-5/4)*y-7
(5/2)*y-((-5/4)*y)-(2/3)+7 = 0
(5/2)*y+(5/4)*y-2/3+7 = 0
15/4*y+19/3 = 0 // - 19/3
15/4*y = -19/3 // : 15/4
y = -19/3/15/4
y = -76/45
y = -76/45
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