bonjour
( 2 x + 5 ) ( x - 2 ) + 4 ( 2.5 - 10 x ) = 2 x² - 39 x
2 x² - 4 x + 5 x - 10 + 10 - 40 x = 2 x² - 39 x
2 x² - 39 x = 2 x² - 39 x
( - x + 5 ) ( - 6 x + 1 ) - 3 x ( 2 x - 10 ) = - x + 5
6 x² - x - 30 x + 5 - 6 x² + 30 x = - x + 5
- x + 5 = - x + 5
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bonjour
( 2 x + 5 ) ( x - 2 ) + 4 ( 2.5 - 10 x ) = 2 x² - 39 x
2 x² - 4 x + 5 x - 10 + 10 - 40 x = 2 x² - 39 x
2 x² - 39 x = 2 x² - 39 x
( - x + 5 ) ( - 6 x + 1 ) - 3 x ( 2 x - 10 ) = - x + 5
6 x² - x - 30 x + 5 - 6 x² + 30 x = - x + 5
- x + 5 = - x + 5