book Maths Puzzle Numerical Ability

2{3x-1}=4 OR 2 square root of 3x-1 equals 4

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book Other Question

x^3-3x^2+3x-9=0

answer can also include complex numbers
I need help finding the value of x in the problem 7(x - 3)= 4(x = 5). Can you please walk me through the steps.