votre cours
k (a + b) = k * a + k * b
donc
-3 (2x - 5) = -3 * 2x - 3 * (-5)
= -6x + 15
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votre cours
k (a + b) = k * a + k * b
donc
-3 (2x - 5) = -3 * 2x - 3 * (-5)
= -6x + 15