exam Maths Puzzle Numerical Ability

can you please help me solve and check: (((2.4x-1.2x=4.8)))

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exam Other Question

Simplify

x/x 2nd power - 16 + x 3rd power/x 2nd power - 14x + 40
The lengths of two sides of a parallelogram are consecutive even integers and the perimeter of the parallelogram is 36 cm. What is the length of the longer side?