exam Maths Puzzle Numerical Ability

solve for X:

3x+3 over 3 = 7x-1 over 5

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exam Other Question

-2m+4=29-7m Matrice
1 3 1/2
1/3 1 4
2 1/4 1
Question: Adam feels least confident about pairwise preference 2. How can he change the value so that the preference comparison matrix will be