book Maths Puzzle Numerical Ability

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.

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book Other Question

2{3x-1}=4 OR 2 square root of 3x-1 equals 4 A box is being pulled by means of two ropes. One rope exerts 100 pounds of force at 28degrees above the horizontal. The other rope exerts 58 pounds of force at 23degrees below the