exam Maths Puzzle Numerical Ability

Please help me solve this problem:
2(x-6)+2=4(x+2)-12

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exam Other Question

(5x+75)^2=250

7(x^2+1)^1/2+28(x^2+1)^-1/2 Please help me on how to figure out the vertex of the equation y=x2(this is x squared)-2x-3.