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May 2019
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Bonsoir pouvez vous m'aider s'il vous plais? Et il faut tout détailler s'il vous plais Merci à ceux qui m'aidereons:
a. 7X-(5X +3) = 5(X-3)+2
b. 7 (n+2)-3 = 25-(3n+4)
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maudmarine
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Bonsoir,
a. 7X-(5X +3) = 5(X-3)+2
7x - 5x - 3 = 5x - 15 + 2
7x - 5x - 5x = - 15 + 2 + 3
7x - 10x = - 15 + 5
- 3x = - 10
x = 10/3
b. 7 (n+2)-3 = 25-(3n+4)
7n + 14 - 3 = 25 - 3n - 4
7n + 3n = - 4 - 14 + 3
10n = - 18 + 3
10n = - 15
n = - 15/10
n = - 3/2
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Verified answer
Bonsoir,a. 7X-(5X +3) = 5(X-3)+2
7x - 5x - 3 = 5x - 15 + 2
7x - 5x - 5x = - 15 + 2 + 3
7x - 10x = - 15 + 5
- 3x = - 10
x = 10/3
b. 7 (n+2)-3 = 25-(3n+4)
7n + 14 - 3 = 25 - 3n - 4
7n + 3n = - 4 - 14 + 3
10n = - 18 + 3
10n = - 15
n = - 15/10
n = - 3/2