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(3/5)*y-(5/3) = (-4/5)*y-7 // - (-4/5)*y-7
(3/5)*y-((-4/5)*y)-(5/3)+7 = 0
(3/5)*y+(4/5)*y-5/3+7 = 0
7/5*y+16/3 = 0 // - 16/3
7/5*y = -16/3 // : 7/5
y = -16/3/7/5
y = -80/21
y = -80/21
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