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y in (-oo:+oo)
1.5*y = 6.5*(1/2)-(7/2) // - 6.5*(1/2)-(7/2)
1.5*y-(6.5*(1/2))+7/2 = 0
1.5*y+7/2-3.25 = 0
1.5*y+0.25 = 0 // - 0.25
1.5*y = -0.25 // : 1.5
y = -0.25/1.5
y = -0.16666667
y = -0.16666667
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