exam Maths Puzzle Numerical Ability

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

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exam Other Question

(s^2/r-s)+(r^2/s-r) Ten liters of 25% salt solution and 15 liters of 35% salt solution are poured into a drum originally containing 30 liters of salt solution. What is the percent concentration of sal