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: x.3 + n = -13
3x + n = -13................persamaan 1
-> x = -4
: x.-4 + n = 22
: -4x + n = 22...............persamaan 2
(eliminasi persamaan 1 dan persamaan 2)
3x + n = -13
-4x + n = 22 (eliminasi dengan pengurangan)
7x = -35
x = -5
(di substitusi ke persamaan 1)
3x + n = -13
3.-5 + n = -13
-15 + n = -13
n = 2
n=2
m+n = -5 + 2 = -3