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y in (-oo:+oo)
(3*(y+3))/5 = 2*y+6 // - 2*y+6
(3*(y+3))/5-(2*y)-6 = 0
(3*(y+3))/5-2*y-6 = 0
(3*(y+3))/5+(-2*5*y)/5+(-6*5)/5 = 0
3*(y+3)-2*5*y-6*5 = 0
9-7*y-30 = 0
-7*y-21 = 0
(-7*y-21)/5 = 0
(-7*y-21)/5 = 0 // * 5
-7*y-21 = 0
-7*y-21 = 0 // + 21
-7*y = 21 // : -7
y = 21/(-7)
y = -3
y = -3
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