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d in (-oo:+oo)
(d-2)/4 = (d+1)/3 // - (d+1)/3
(d-2)/4-((d+1)/3) = 0
(d-2)/4+(-1*(d+1))/3 = 0
(3*(d-2))/(3*4)+(-1*4*(d+1))/(3*4) = 0
3*(d-2)-1*4*(d+1) = 0
-d-10 = 0
(-d-10)/(3*4) = 0
(-d-10)/(3*4) = 0 // * 3*4
-d-10 = 0
-d-10 = 0 // + 10
-d = 10 // * -1
d = -10
d = -10
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