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y in (-oo:+oo)
(3/5)*y = -7/20 // + -7/20
(3/5)*y-(-7/20) = 0
(3/5)*y+7/20 = 0
3/5*y+7/20 = 0 // - 7/20
3/5*y = -7/20 // : 3/5
y = -7/20/3/5
y = -7/12
y = -7/12
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