exam Maths Puzzle Numerical Ability

10x-1/4=9x+3/8

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exam Other Question

-4y - (5y +6) = -7y + 3 i need a step by step on how to solve
-4y (-5y +6) = -7y + 3
20y + 6 = -7y + 3
i got stuck here A boat travels 45 mi upstream (against the current) in 5h. the boat travels the same distance downstream 3 h. what is the rate of the boat in still water? what is the rate of the current?