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algebra 2

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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

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