exam Maths Puzzle Numerical Ability

Can you check my answer? I am solving for x.

x+4 = 3x
_ = __

-4 = 36

Answer: x=6

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exam Other Question

m<1+m<2=180 degrees given
m<2=m<3 given

m<1+m<3=180 degrees property????????????? solve the equation if possible
15/x-4=6/x+3
thanks a lot