exam Maths Puzzle Numerical Ability

(s^2/r-s)+(r^2/s-r)

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exam Other Question

9:
(x3 + 4x2 - 2x + 5) - (3x3 - 3x2 + x - 2) Can someone help me solve this problem?

I need to solve the following equation for x, and show proof:

7(3x + 4) = 8(2x + 5) + 13

Thanks,
Sher