bonsoir
a
a + 5
- 3 ( a + 5 ) = - 3 a - 15
- 3 a - 15 - 15 = - 3 a - 30
2 ( - 3 a - 30 ) = - 6 a - 60
- 6 a - 60 + 2 a
= - 4 a - 60
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bonsoir
a
a + 5
- 3 ( a + 5 ) = - 3 a - 15
- 3 a - 15 - 15 = - 3 a - 30
2 ( - 3 a - 30 ) = - 6 a - 60
- 6 a - 60 + 2 a
= - 4 a - 60