exam Maths Puzzle Numerical Ability

please help me solve 4/5x=5/4

i know i need to flip the 4/5x but i keep getting confused i think the answer is
1.5 if it is im just confused on the check

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exam Other Question

The perimeter of a rectangle is 76 meters. the length is 16 meters less than twice the width. find the length of the rectangle. Solve the system y=2x+3 and y=4x+7 using the substitution method.