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Sagot :

AYUDA

bjr

A. 7 (n+2)-3=25-(3n+4)

7n+14 - 3 = 25 - 3n - 4

7n + 11 = -3n + 21

7n+3n = 21-11

10n = 10

n = 1

B. 4y+3(4y-2)=3(y+1)

4y + 12y - 6 = 3y + 3

16y - 3y = 3 + 6

13y = 9

y = 9/13

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