exam Maths Puzzle Numerical Ability

Solve the equation.
5(2x - 1) = 20

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exam Other Question

3sqrt6/sqrt2 This problem is on Solving Systems of Equations In Three Variables

(1) X-4y+3z=-27
2x+2y-3z=22
4z=-16

(2) 3x-2y+4z=15
x-y+z=3