Please help System of Equation in Three variables?
1) 2a+c=-10
b-c=15
a-2b+c=-5
2) x+y+z=3
13x+2x=2
-x-5z=-5
3)x-y+3z=3
-2x+2y-6z=6
y-5z=-3
4)3x-2y+z=1
-x+y-z=2
5x+2y+10z=-39
5)3x-2y+z=1
-x-y-z=-3
3x-2y+3z=-12
15 years ago 999999.99
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