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y in (-oo:+oo)
6*(y+1/2)+7*y = 0
6*(y+1/2)+7*y = 0
13*y+3 = 0
13*y+3 = 0
13*y+3 = 0 // - 3
13*y = -3 // : 13
y = -3/13
y = -3/13
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