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7/20 = -y/5 // + -y/5
7/20-(-y/5) = 0
(1/5)*y+7/20 = 0
1/5*y+7/20 = 0 // - 7/20
1/5*y = -7/20 // : 1/5
y = -7/20/1/5
y = -7/4
y = -7/4
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