book Maths Puzzle Numerical Ability

i would like some one to shwo me how to do this equation please.

2/3(5y-4)-3/5(2y+8)=0

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book Other Question

can we correlate the complx numbers into political science.former chief election commissioner of india opined that solvation of langrangian equations gives results for political pr i'm trying to find the inverse of a 2*1 and i wanted to know how do you do that?