exam Maths Puzzle Numerical Ability

please help me solve this equation: if 3x-1=11, what is the value of 2x+x?
Thank you all in advance!!!!!!

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exam Other Question

solve by using the quadratic formula
4x^2-3x+3=0 120 day treasury bill has a money market yield of 3.25. it's holding period and effecctive annual yields are ?
Solve HPY and EAY

Rmm=HPY(360/t)
3.25 = x (360/t)

I can't r