exam Maths Puzzle Numerical Ability

solve for x:

5x-9=8x+6

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exam Other Question

Solve for R?

100=70/(1+R)+60/(1+R)^2 Find coordinates for the centroid of the triangle whose vertices are (a) (-1,5), (-2,8) and (3,3); b) (2,7),(8,1) and (14,11); (c) (a,p), (b,q) and (c,r).