exam Maths Puzzle Numerical Ability

2ax+1=ax+5 (solve for x)
ax+1=5
ax=4
x=4/a

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exam Other Question

f(x) = 5x + 21/x; f(x) = -38 How many 6 digit numbers can be made with any combination and permutation of 3 and 7? (e.g. 377777, 737777, 777333, 733733, 333337)