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a+b = -1
2a - b = 10 +
3a = 9
a = 9/3
a = 3
a + b = -1
3 + b = -1
b = -1 - 3
b = -4
-2c = 4 + 2a
-2c = 4 + 2(3)
-2c = 10
c = 10/-2
c = -5