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6x+6y+6z=78 - 5x+2y+x=50 = 4y+4z=28
4y+4z=28/:4
y+z=7
x+y+z=13 - y+z=7 =x=6
36+2y=50/:2
18+y=25/-18
y=7
6+7+z=13/-13
z=0