exam Maths Puzzle Numerical Ability

I need major help

solve each of the eqautions of x

25x=13

and
2(x-5)^2=3

thanks

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exam Other Question

18=y/7 Use Gauss-Jordan elimination method to solve

2x-5y+5z=17
x-2y+3z=9
-x+3y=-4

I NEED HELP KNOWING HOW TO USE THIS METHOD