x+x+x=30 => 3x=30 => x=10
x+y+y=18 => 10+2y=18 => 2y=8 => y=4
4-z=2 => -z=-2 => z=2=2+10x2= 22
22
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x+x+x=30 => 3x=30 => x=10
x+y+y=18 => 10+2y=18 => 2y=8 => y=4
4-z=2 => -z=-2 => z=2=2+10x2= 22
22