exam Maths Puzzle Numerical Ability

how do i solve
5x+2y=4
3x+4y+2z=6
7x+3y+4z=29

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exam Other Question

|x-y|+6(4x-|-6+y|) when x=-2 and y=3/2 Using Addition, subtraction, multiplication, division, Parenthesis make an expression using the numbers 1, 3, 4, 6 once and the total should be 24.