exam Maths Puzzle Numerical Ability

Can you please show me how solve this equation -5y = y + 6

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exam Other Question

1/3(X-4)+ 5/6(X+2)= X+3

Thanks. A sailboat travels 20 miles downstream in 3 hours.It returns in 4 hours. Find the speed of the sailboat in still water and the rate of the current.