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Sagot :

1). -2x+7= 9x -6
-2x-9x= -6 -7
-11x = -13
X = -13 /-11
x = 0.26

2). 4x - 11 = 13x - 8
4x - 13x = -8 + 11
-9x = 3
x = 3/-9
x = -0,33

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