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n in (-oo:+oo)
(-2/3)*(n+1/2) = 4/5-n+3/4 // - 4/5-n+3/4
(-2/3)*(n+1/2)+n-(4/5)-(3/4) = 0
(-2/3)*(n+1/2)+n-4/5-3/4 = 0
n-2/3*(n+1/2)-4/5-3/4 = 0
(-2/3*4*5*(n+1/2))/(4*5)+(4*5*n)/(4*5)+(-4*4)/(4*5)+(-3*5)/(4*5) = 0
4*5*n-2/3*4*5*(n+1/2)-4*4-3*5 = 0
20/3*n-16-15-20/3 = 0
20/3*n-68/3-15 = 0
20/3*n-113/3 = 0
(20/3*n-113/3)/(4*5) = 0
(20/3*n-113/3)/(4*5) = 0 // * 4*5
20/3*n-113/3 = 0
20/3*n-113/3 = 0 // + 113/3
20/3*n = 113/3 // : 20/3
n = 113/3/20/3
n = 113/20
n = 113/20
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