3x-4y+70z=0 ,
2x+3y-10z=0 ,
x+2y+3z=13
simplify x, y and z.
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x+2y+3z=13
=>5xyz=13
=>xyz=13/5
=>xyz=2 3/5
=>5xyz=13
=>xyz=13/5
=>xyz=2 3/5
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