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Sagot :

Bonsoir,

B = x (2x + 7) - 5( 6 + x)

= 2x² +7x -30-5x

= 2x² +2x -30

Bjr

B = x(2x+7)-5(6+x)

B = 2x²+7x-5(6+x)

B = 2x²+7x-30-5x

B = 2x²+2x-30

Voilà !

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