exam Maths Puzzle Numerical Ability

[11+2x]=5, [8x+1]=23, [1/2x-3]=2 how do i solve these equations?

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exam Other Question

Find the angles of a triangle where one angle is three times a second angle and six times the third angle.
I think the variables should be:
x = one angle
3x = second angle
6x = third angle Find the solution of using substitution, elimination or Cramers Rule
x^2+y^2=7
x-y^2=-1