exam Maths Puzzle Numerical Ability

find the soultion to the equation:
6x-3=-2x+21

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exam Other Question

Show your steps in simplifying the radical expression. Make sure to follow the pattern shown in the examples 3 cubed of square root of 45

I would appreciate help with the following :

Simplify by adding like terms :

-2^0x^2y^2x^-2 + 3y^2/x^2 - 4x^-2/y^-2 + 5y^2