exam Maths Puzzle Numerical Ability

Please help me to solve for A
((20A*3B)/(2M-10))+((45A-32B)/(40M+29))=(50M-600)/(75B-22)

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exam Other Question

The problem is:

5+ ln x^2 = 4

I have absolutely no clue how to solve this problem.

Please and thank you in advance. I'd be greatful if someone can give me some guidance on this question.

A particular harmonic drive for use ina robot jointed arm has one less tooth on the flexible spline than o