exam Maths Puzzle Numerical Ability

what is x - 4 to the 3/2 power = 27

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exam Other Question

use elimination to solve each system of equations

2/3x-1/2y=14
5/6x-1/2y=18
Can someone help me solve this problem?

I need to solve for x and check the results:

-4(2x - 3) = -8x + 5

Thanks,
Sher