Question 67314
5(X-3)/4=x+1
5x-15=4x+4
x=19
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3(x+12)/5 = x+2
3x+36=5x+10
2x=26
x=13
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2/(3n+4)=10-4/3n
2/(3n+4) = (30n-4)/3n
Cross-multiply to get:
6n=(3n+4)(30n-4)
6n=90n^2+108n-16
90n^2+102n-16=0
45n^2+51n-8=0
Use the quadratic formula to get:
n=[-51+-sqrt(51^2-4*45*-8)]/90
n=[-51+-sqrt(4041)]/90
n=0.139654... or n=-1.27298...
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c=5over6 and d=1over4,evaluate:8cover-d 
8c/(-d)=8*5/(-1/4)= 40/(-1/4)=-160
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Cheers,
Stan H.