Explications étape par étape:
A/ 10x - 5 = 6x + 15
10x - 6x = 5 + 15
4x = 20. x = 20/4. x = 5
B/ -12x + 4 -42x + 98 = 0
-54x + 102 = 0
54x = -102. x= -102/54 = 51/27 = 17/9
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Explications étape par étape:
A/ 10x - 5 = 6x + 15
10x - 6x = 5 + 15
4x = 20. x = 20/4. x = 5
B/ -12x + 4 -42x + 98 = 0
-54x + 102 = 0
54x = -102. x= -102/54 = 51/27 = 17/9