bonjour
P = y + y + 2 + x + y + 2 + x + y = 2 x + 4 y + 4
- ( 7 x + 4 ) + ( 9 x - 10 )
= - 7 x - 4 + 9 x - 10
= 2 x - 14
7 ( 2 x + 3 ) = 56
14 x + 21 = 56
14 x = 56 - 21
14 x = 35
x = 35/14
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bonjour
P = y + y + 2 + x + y + 2 + x + y = 2 x + 4 y + 4
- ( 7 x + 4 ) + ( 9 x - 10 )
= - 7 x - 4 + 9 x - 10
= 2 x - 14
7 ( 2 x + 3 ) = 56
14 x + 21 = 56
14 x = 56 - 21
14 x = 35
x = 35/14